SCAR MK 17 TechnicalRepairStandard Redacted

SW370-CF-TRS-010

TECHNICAL REPAIR STANDARD FOR MK 17 MOD 0 7.62 MM SPECIAL OPERATIONS FORCES (SOF) COMBAT ASSAULT RIFLE, HEAVY (NSN 1005-13-119-7703)

March 31, 2008

0640-LP-105-8807

THIS PAGE INTENTIONALLY LEFT BLANK


SW370-CF-TRS-010

CHANGE PAGE Change No.

Date

Title or Brief Description

Signature of Validating Officer

Original

3/31/08

Update manual per FNH and Crane.

Ron Webster

A

SW370-CF-TRS-010

LIST OF EFFECTIVE PAGES NOTE: Zero in Change No. column indicates original page or work package. Date of issue for this manual’s current version is: Original March 2008 TOTAL NUMBER OF CHAPTERS IN THIS DOCUMENT IS 4. TOTAL NUMBER OF PAGES IN THIS DOCUMENT IS 322 CONSISTING OF THE FOLLOWING: Page No.

Change No.

Front Cover

0

Change Page A-B

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How to Use this Manual a-d

0

Warnings e-h

0

Reporting Errors i-ii

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Acronyms iii-iv

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Table of Contents v-viii

0

List of Figures ix-xxvi

0

List of Tables xxvii-xxviii

0

Chp 1 1-14

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Chp 2 1-188

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Chp 3 1-8

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Chp 4 1-8

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Appendix A 1-2

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Appendix B 1-34

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Appendix C 1-2

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Appendix D 1-8

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Appendix E 1-8

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Appendix F 1-2

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Appendix G 1-2

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Appendix H 1-2

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Appendix I 1-2

0

B

SW370-CF-TRS-010

HOW TO USE THIS MANUAL 1.

GENERAL.

This manual has been prepared and illustrated to provide maintenance personnel all the information required to support the MK 17 MOD 0 7.62 mm. To locate a procedure in the manual quickly, check the Table of Contents in the front of the manual. a. References are to sections in this manual or to other publications. b. Throughout this manual, text is keyed to illustrations by use of numbered callouts. When an item is called out, a number in parentheses in the text corresponds with a number on the illustration. c. Each task begins with an initial setup. It tells you what you need to do the task: tools, materials, parts, and other publications. It tells you what must be done to the equipment before you begin the task and provides general safety instructions. 2.

INDEXES.

This manual is organized to help you quickly find the information you need. a. Table of Contents. The Table of Contents lists, in the order of presentation, all chapters, sections, and paragraphs. b. Cross-Reference Indexes. A list in National Item Identification Number (NIIN) sequence of all National Stock numbered items appearing in listings, followed by list in alphanumeric sequence of all part numbers appearing in listing. National Stock Numbers (NSNs) and Part Numbers are cross-referenced to each illustration figure and item number in alphanumeric sequence and cross-references NSN and Part Number. 3.

LISTS. a. List of Abbreviations. An alphabetical list of uncommon abbreviations used in the manual is located on page iii.

4.

SAFETY WARNING ICONS EXPLANATION. FLYING PROJECTILE – Spring-loaded parts could release and hit body, causing injury or death.

EAR PROTECTION – Headphones over ears show that noise level will harm ears.

ELECTRICAL – Electrical wire to arm with electricity symbol running through human body shows that shock hazard is present.

a

SW370-CF-TRS-010

4.

SAFETY WARNING ICONS EXPLANATION. (CONT.) EXPLOSION – Rapidly expanding symbol shows that material may explode if subjected to high temperatures, sources of ignition, or high pressure.

EYE PROTECTION – Person with goggles shows that material will injure eyes.

WEAPON FIRE – Accidental discharge of weapon could penetrate body, causing serious injury or death.

5.

HAZARDOUS MATERIALS ICONS EXPLANATION. CHEMICAL – Drops of liquid on hand show that material could cause burns or irritation to human skin or tissue.

EYE PROTECTION – Person with goggles shows that material could injure eyes.

FIRE – Flame shows that material may ignite and cause burns.

VAPOR – Human figure in cloud shows that material vapors present danger to life or health.

b

SW370-CF-TRS-010

5.

HAZARDOUS MATERIALS ICONS EXPLANATION. (CONT.) HOT AREA – Hand over object radiating heat shows that part is hot and can cause burns.

LASER LIGHT – Laser light hazard symbol indicates extreme danger for eyes from laser beams and reflections.

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SW370-CF-TRS-010

WARNING SUMMARY This warning summary contains general safety warnings and hazardous materials warnings that must be understood and applied during equipment’s operation and maintenance. Failure to observe these precautions may result in serious injury or death to personnel. Also included are explanations of safety and hazardous materials icons used within Technical Repair Standard (TRS). 1.

DEFINITION OF THE FOLLOWING ALERTS THROUGHOUT THIS MANUAL.

WARNING – Identifies clear danger to person performing procedure. CAUTION – Identifies risk of damage to equipment. NOTE – Used to highlight essential procedures, conditions, and statements or to convey important instructional data to user. 2.

FIRST AID.

For first aid information, refer to OP50100, First Aid. 3.

GENERAL SAFETY WARNINGS DESCRIPTION. WARNING

Before starting inspection, clear weapon. Do not pull trigger until weapon has been cleared. Inspect chamber to ensure it is empty, and check that no ammunition is in position to be introduced.

WARNING

Before starting inspection, do not actuate trigger until weapon has been cleared. Inspect chamber to be sure that it is empty. Check for obstructions in barrel bore. WARNING

Use appropriate PPE for the job. Striking any object with hammer can result in flying debris or parts. Safety glasses or goggles are required when performing maintenance. e

SW370-CF-TRS-010

3.

GENERAL SAFETY WARNINGS DESCRIPTION. (CONT.) WARNING

Ensure weapon is unloaded prior to gauging. WARNING

All spring-loaded assemblies are under spring tension; unintentional release will result in flying parts and possible injury. WARNING

Use eye protection for spring-loaded mechanisms. WARNING

Failure to comply with gauging requirements can create condition where weapon can fire out of “battery” or fail to fire at critical moment. In either condition serious injury or loss of life can result.

f

SW370-CF-TRS-010

4.

CAUTIONS. CAUTION Do not use dry cleaning solvent on plastic or rubber parts, and components. Due to aggressive nature of solvent, it can render plastic or rubber parts unserviceable. CAUTION Do not allow hammer to fall freely striking receiver; this can damage hammer and bolt catch/ release. CAUTION Make sure all ancillary and Special Operation Particular Modifications (SOPMOD)/optics are removed from weapon prior to maintenance. CAUTION Be sure to clean weapon before initial use. Leaving initial protective lubricant in weapon can cause stoppage, malfunction, or failure due to over pressure. CAUTION Do not attempt to interchange other magazine parts (i.e., M4/M16 etc.) with MK 17 MOD 0 magazine parts. CAUTION Removing barrel assembly from upper receiver frame without barrel extension clearing cut, recessed portion of receiver frame could result in damage to frame. Do not angle or rock barrel out of frame.

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SW370-CF-TRS-010

TECHNICAL REPAIR STANDARD FOR MK 17 MOD 0 7.62 MM SOF COMBAT ASSAULT RIFLE, HEAVY (NSN 1005-13-119-7703)

REPORTING ERRORS AND RECOMMENDING IMPROVEMENTS You can help improve this manual. Please let us know if you find any mistakes or if you know of a way to improve a procedure. Mail DA Form 2027 ( Recommended Changes to Publications and Blank Forms ) directly to: Small Arms Weapons Division, Joint Special Operati

This publication is available through Small Arms Weapons Division, Joint Special Operations Response Department, NSWC, Crane Division.

March 2008

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SW370-CF-TRS-010

LIST OF ACRONYMS ‘A’ BOI CAGEC CCW CLP CQC CPC CW DoD EGLM EIR IAW LAW LB LH LOP LSA MOA MRC NIIN NSN NSWC OM PMCS PN PPE PQDR RBC RH RPSTL S ‘S’ SD SSAVIE SOF SOPMOD TM TMDER TRS U/I U/M UOC

Automatic Basis of Issue Contractor and Government Entity Code Counterclockwise Cleaner, Lubricant, and Preservative Close Quarter Combat Corrosion, Prevention, and Controls Clockwise Department of Defense Enhance Grenade Launcher Manual Equipment Improvement Recommendations In Accordance With Lubricating Oil, Arctic Weapons Long Barrel Left-hand Length of Pull Lubricating Oil, Weapons Minutes of Angle Maintenance Requirement Cards National Item Identification Number National Stock Number Naval Surface Warfare Center Operator’s Manual Preventive Maintenance Checks and Services Part Number Personal Protective Equipment Product Quality Deficiency Report Rifle Bore Cleaner Right-hand Repair Parts and Special Tools List Standard Safe Dry Cleaning Solvent Sustainment, Asset Visibility, and Information Exchange Special Operations Force Special Operation Particular Modifications Technical Manual Technical Manual Deficiency/Evaluation Report Technical Repair Standard Unit of Issue Unit of Measure Usable on Code

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SW370-CF-TRS-010

TABLE OF CONTENTS SECTION

PAGE

CHANGE PAGE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A LIST OF EFFECTIVE PAGES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B HOW TO USE THIS MANUAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . a WARNING SUMMARY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . e REPORTING ERRORS AND RECOMMENDING IMPROVEMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . iii LIST OF ACRONYMS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . iii LIST OF FIGURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ix LIST OF TABLES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xxvii CHAPTER 1

INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 SECTION I.GENERAL INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 1-1. SCOPE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 1-2. DESTRUCTION OF NAVY MATERIAL TO PREVENT ENEMY USE. . . . . . . . 1-1 1-3. DEMILITARIZATION OF SMALL ARMS RESIDUE. . . . . . . . . . . . . . . . . . . . . . 1-1 1-4. REPORTING EQUIPMENT IMPROVEMENT RECOMMENDATIONS (EIR). . 1-1 SECTION II. EQUIPMENT DESCRIPTION AND DATA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2 1-5. MAJOR COMPONENTS LOCATION AND DESCRIPTION.. . . . . . . . . . . . . . . 1-2 1-6. NOMENCLATURE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3 1-7. TECHNICAL DATA.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5 1-8. OPERATING PRINCIPLES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6 1-9. CORROSION, PREVENTION, AND CONTROLS (CPC).. . . . . . . . . . . . . . . . 1-13

CHAPTER 2

MAINTENANCE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1 SECTION I. REPAIR PARTS, SPECIAL TOOLS, AND COMMON TOOLS AND EQUIPMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1 2-1. REPAIR PARTS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1 2-2. SPECIAL TOOLS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1 2-3. EXPENDABLE/DURABLE SUPPLIES AND MATERIALS LIST.. . . . . . . . . . . . 2-1 SECTION II. SERVICE UPON RECEIPT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1 2-4. GENERAL.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1 2-5. SERVICE UPON RECEIPT OF MATERIAL.. . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1 SECTION III. PREVENTIVE MAITNENANCE CHECKS AND SERVICES (PMCS) . . . . . . . . 2-2 2-6. PREVENTIVE MAITNENANCE CHECKS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2 SECTION IV. TROUBLESHOOTING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10 2-7. MAINTENANCE TROUBLESHOOTING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10 2-8. TROUBLESHOOTING PROCEDURES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11 SECTION V. FIELDSTRIP PROCEDURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-19 2-9. SAFETY CHECK. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-19 2-10. FIELDSTRIP PROCEDURES.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-20 SECTION VI. MAINTENANCE PROCEDURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-26 2-11. TRIGGER MODULE, COMPLETE (501H) MAINTENANCE. . . . . . . . . . . . . . 2-26 2-12. BUTTSTOCK MODULE (800) MAINTENANCE. . . . . . . . . . . . . . . . . . . . . . . . 2-69 2-13. MOVING PARTS ASSEMBLY (401H) MAINTENANCE.. . . . . . . . . . . . . . . . . 2-90 2-14. COMPLETE RECEIVER ASSEMBLY (S) (201H-S) MAINTENANCE. . . . . . 2-105 2-15. MAGAZINE ASSEMBLY (S) (601H) MAINTENANCE. . . . . . . . . . . . . . . . . . 2-177 2-16. REASSEMBLE FROM FIELDSTRIP. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-182 2-17. SAFETY CHECK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-187

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TABLE OF CONTENTS (CONT.) SECTION

PAGE

CHAPTER 3

UNIT MAINTENANCE GAUGING INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1 SECTION I. REQUIRED GAUGES AND GAUGING REQUIREMENTS . . . . . . . . . . . . . . . 3-1 3-1. REQUIRED GAUGES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1 3-2. GAUGING REQUIREMENTS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1 3-3. GENERAL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1 SECTION II. GAUGING PROCEDURES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1 3-4. COMPLETE RECEIVER ASSEMBLY. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1 3-5. TRIGGER MODULE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4 3-6. COMPLETE BARREL ASSEMBLY. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5

CHAPTER 4

UNIT MAINTENANCE BORESCOPING BARREL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1 SECTION I. TECHNICAL INFORMATION AND BACKGROUND . . . . . . . . . . . . . . . . . . . . 4-1 4-1. TECHNICAL DATA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1 4-2. BACKGROUND. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1 SECTION II. BORESCOPE MAINTENANCE/SETUP/INSPECTIONS . . . . . . . . . . . . . . . . . 4-1 4-3. MAINTENANCE OF BORESCOPE.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1 SECTION III. BORESCOPE COMPONENTS AND ASSEMBLY . . . . . . . . . . . . . . . . . . . . . . 4-2 4-4. COMPONENTS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2 4-5. ASSEMBLING BORESCOPE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3 4-6. INSPECTING.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5 4-7. SUMMARY.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7

APPENDIX A

REFERENCES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1 A-1. TECHNICAL MANUALS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1 A-2. DEPARTMENT OF DEFENSE REGULATIONS. . . . . . . . . . . . . . . . . . . . . . . . A-1

APPENDIX B

MAINTENANCE REPAIR PARTS AND SPECIAL TOOLS LIST . . . . . . . . . . . . . . . . . . . . . . . B-1 SECTION I. INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1 B-1. SCOPE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1 B-2. GENERAL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1 B-3. REPAIR PARTS LIST COMPONENTS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1 B-4. EXPLANATION OF COLUMNS (SECTION II). . . . . . . . . . . . . . . . . . . . . . . . . B-1 B-5. COLORS DEFINED. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-2 B-6. SUPPORT EXPLANATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-2 B-7. EXPLANATION OF COLUMNS.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-3 B-8. SPECIAL INFORMATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-4 B-9. HOW TO LOCATE REPAIR PARTS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-4 SECTION II. REPAIR PARTS LIST. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-5 SECTION III. CROSS REFERENCE INDEXES, PART NUMBER . . . . . . . . . . . . . . . . . . . . B-23 SECTION IV. CROSS REFERENCE INDEXES, FIGURE AND ITEM NUMBER. . . . . . . . . B-27 SECTION V. SPECIAL TOOLS LIST. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-31 B-10. SCAR T-HANDLE TORQUE WRENCH CALIBRATION PROCEDURES. . . . B-33

APPENDIX C

EXPENDABLE/DURABLE SUPPLIES AND MATERIALS LIST . . . . . . . . . . . . . . . . . . . . . . . C-1 SECTION I. INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-1 C-1. SCOPE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-1 C-2. EXPLANATION OF COLUMNS.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-1 SECTION II.EXPENDABLE SUPPLIES AND MATERIALS LIST . . . . . . . . . . . . . . . . . . . . . . . . C-2 vi

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TABLE OF CONTENTS (CONT.) SECTION

PAGE

APPENDIX D

PARTS COMMONALITY (MK 17 MOD 0 & MK 16 MOD 0) QUICK REFERENCE TABLE . . . D-1 SECTION I.GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-1

APPENDIX E

FIELD REJECT ASSESSMENT CHECKLIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-1 E-1. REFERENCES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-1 E-2. GAUGES AND EQUIPMENT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-2

APPENDIX F

PARTS REPLACEMENT SCHEDULE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-1

APPENDIX G

TORQUE CHART . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . G-1 G-1. MK 17 MOD 0 TORQUE SETTING CHART.. . . . . . . . . . . . . . . . . . . . . . . . . . .G-1

APPENDIX H

STANDARD FORM 368 PRODUCT QUALITY DEFICIENCY REPORT (PQDF) . . . . . . . . . . H-1

APPENDIX I

TECHNICAL MANUAL DEFICIENCY/EVALUATION REPORT (TMDER) . . . . . . . . . . . . . . . . I-1

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LIST OF FIGURES FIGURE

PAGE

FIGURE 1-1.

MAJOR COMPONENTS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

FIGURE 1-2.

NOMENCLATURE LEFT SIDE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

FIGURE 1-3.

NOMENCLATURE RIGHT SIDE.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

FIGURE 1-4.

SAFE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6

FIGURE 1-5.

SEMI-AUTOMATIC. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7

FIGURE 1-6.

AUTOMATIC. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8

FIGURE 1-7.

PERCUSSION AND FIRING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9

FIGURE 1-8.

BULLET PROPELS FORWARD. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9

FIGURE 1-9.

GAS PISTON ASSEMBLY TOWARDS REAR. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10

FIGURE 1-10.

UNSUPPRESSED AND SUPPRESSED CONDITIONS.. . . . . . . . . . . . . . . . . . . . . . . 1-10

FIGURE 1-11.

HAMMER COCKED. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11

FIGURE 1-12.

HAMMER FALLEN. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11

FIGURE 1-13.

COCKED POSITION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-12

FIGURE 1-14.

ENGAGES FRONT TOOTH OF TRIGGER.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-12

FIGURE 1-15.

HAMMER RELEASED TO STRIKE FIRING PIN. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-12

FIGURE 1-16.

TRIGGER RELEASED. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-12

FIGURE 2-1.

COMPLETE RECEIVER ASSEMBLY.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4

FIGURE 2-2.

MOVING PARTS ASSEMBLY.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6

FIGURE 2-3.

BUTTSTOCK MODULE.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7

FIGURE 2-4.

TRIGGER MODULE, COMPLETE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8

FIGURE 2-5.

MAGAZINE ASSEMBLY. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9

FIGURE 2-6.

MAGAZINE LOCKING NOTCH.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11

FIGURE 2-7.

MAGAZINE CATCH RELEASE.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11

FIGURE 2-8.

SELECTOR LEVER ON ‘S’. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12

FIGURE 2-9.

FIRING PIN. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12

FIGURE 2-10.

HAMMER.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12

FIGURE 2-11.

HAMMER SPRING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13

FIGURE 2-12.

LOCKING LUGS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13

FIGURE 2-13.

INSPECT EXTRACTOR. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-14

FIGURE 2-14.

EJECTOR AND EJECTOR SPRING.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-14

FIGURE 2-15.

BOLT CARRIER. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-15

FIGURE 2-16.

RETURN SPRING ASSEMBLY.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-15 ix

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LIST OF FIGURES (CONT.) FIGURE

PAGE

FIGURE 2-17.

TRIGGER OR TRIGGER RETURN SPRING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-16

FIGURE 2-18.

PISTON RINGS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-17

FIGURE 2-19.

BOLT CATCH/RELEASE SUPPORT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-18

FIGURE 2-20.

SELECTOR CAM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-18

FIGURE 2-21.

UNLOAD AND CLEAR. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-19

FIGURE 2-22.

RELEASE TAKEDOWN PIN, TRIGGER MODULE. . . . . . . . . . . . . . . . . . . . . . . . . . . 2-20

FIGURE 2-23.

REMOVE TRIGGER MODULE, COMPLETE.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-20

FIGURE 2-24.

REMOVE BUTTSTOCK MODULE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-21

FIGURE 2-25.

RELEASE MOVING PARTS ASSEMBLY. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-21

FIGURE 2-26.

REMOVE CHARGING HANDLE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-21

FIGURE 2-27.

REMOVE MOVING PARTS ASSEMBLY. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-22

FIGURE 2-28.

REMOVE RETURN SPRING ASSEMBLY. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-22

FIGURE 2-29.

REMOVE FIRING PIN RETAINING PIN.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-22

FIGURE 2-30.

REMOVE FIRING PIN. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-23

FIGURE 2-31.

REMOVE BOLT CAM PIN AND BOLT ASSEMBLY.. . . . . . . . . . . . . . . . . . . . . . . . . . 2-23

FIGURE 2-32.

DISASSEMBLE MAGAZINE, 7.62 MM.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-24

FIGURE 2-33.

COMPLETE FIELDSTRIP. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-25

FIGURE 2-34.

TRIGGER MODULE, COMPLETE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-27

FIGURE 2-35.

INSTALL TRIGGER MODULE, COMPLETE (501H) ONTO BLOCK, TRIGGER MODULE VISE (UT1831). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-28

FIGURE 2-36.

TILTING TRIGGER MODULE, COMPLETE (501H) TO LEFT.. . . . . . . . . . . . . . . . . . 2-28

FIGURE 2-37.

LOOSEN HEXAGON SOCKET HEAD CAP SCREW (528).. . . . . . . . . . . . . . . . . . . . 2-28

FIGURE 2-38.

REMOVE PISTOL GRIP (527) FROM TRIGGER MODULE, COMPLETE (501H). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-28

FIGURE 2-39.

PUNCH OUT SQUARE NUT (529).. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-28

FIGURE 2-40.

INSPECT PISTOL GRIP (527) INTERFACE FOR DISCREPANCIES.. . . . . . . . . . . . 2-29

FIGURE 2-41.

INSPECT SQUARE NUT (529) FOR DISCREPANCIES. . . . . . . . . . . . . . . . . . . . . . . 2-29

FIGURE 2-42.

INSPECT LOCK WASHER (526) FOR CRACKS AND UNUSUAL WEAR. . . . . . . . . 2-29

FIGURE 2-43.

INSPECT PISTOL GRIP (527) FOR DISCREPANCIES. . . . . . . . . . . . . . . . . . . . . . . 2-29

FIGURE 2-44.

INSPECT HEXAGON SOCKET HEAD CAP SCREW (528) FOR WEAR OR STRIPPING ON THREADS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-29

FIGURE 2-45.

INSERT SQUARE NUT (529) INTO SLOT.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-30

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FIGURE 2-46.

SEAT PISTOL GRIP (527) ONTO TRIGGER MODULE, COMPLETE (501H). . . . . . . 2-30

FIGURE 2-47.

INSERT HEXAGON SOCKET HEAD CAP SCREW (528) INTO PROPER HOLE AND HAND-TIGHTEN. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-30

FIGURE 2-48.

USING TORQUE SCREWDRIVER (UT1937), TORQUE SCREW UNTIL IT SETS.. . 2-30

FIGURE 2-49.

REMOVE CLIP, RETAINING (513).. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-31

FIGURE 2-50.

REMOVE TAKEDOWN PIN, TRIGGER MODULE (512). . . . . . . . . . . . . . . . . . . . . . . 2-31

FIGURE 2-51.

INSPECT CLIP, RETAINING (513). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-32

FIGURE 2-52.

INSPECT TAKEDOWN PIN, TRIGGER MODULE (512). . . . . . . . . . . . . . . . . . . . . . . 2-32

FIGURE 2-53.

INSTALL TAKEDOWN PIN, TRIGGER MODULE (512).. . . . . . . . . . . . . . . . . . . . . . . 2-33

FIGURE 2-54.

INSTALL CLIP, RETAINING (513). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-33

FIGURE 2-55.

PRESS AUTOMATIC SEAR (581) FORWARD.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-34

FIGURE 2-56.

WITH INDEX FINGER, RIDE HAMMER (555) FORWARD WHILE PULLING TRIGGER (545). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-34

FIGURE 2-57.

TAP ON BOLT CATCH/RELEASE SUPPORT (576) ON RIGHT SIDE OF TRIGGER MODULE, COMPLETE (501H). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-34

FIGURE 2-58.

ENSURE SPRING-TYPE STRAIGHT PIN, SLOTTED (579) CLEARS PROTECTIVE FINGERS.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-34

FIGURE 2-59.

PUNCH OUT SPRING-TYPE STRAIGHT PIN, SLOTTED (579) AND REMOVE.. . . . 2-35

FIGURE 2-60.

KEEP PUNCH IN PLACE AFTER REMOVAL OF SPRING-TYPE STRAIGHT PIN, SLOTTED (579) BEFORE REMOVAL OF BOLT CATCH/RELEASE (578H). . . . . . . . 2-35

FIGURE 2-61.

KEEP FINGER ON BOLT CATCH/RELEASE (578H) TO MAINTAIN CONTROL OF BOLT CATCH/RELEASE SPRING (577). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-35

FIGURE 2-62.

REMOVE BOLT CATCH/RELEASE SPRING (577) FROM BOLT CATCH/RELEASE SUPPORT (576). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-36

FIGURE 2-63.

INSPECT BOLT CATCH/RELEASE (578H) FOR DISCREPANCIES.. . . . . . . . . . . . . 2-37

FIGURE 2-64.

INSPECT BOLT CATCH/RELEASE SPRING (577) FOR DISCREPANCIES.. . . . . . . 2-37

FIGURE 2-65.

PLACE BOLT CATCH/RELEASE SPRING (577) INTO CORRESPONDING HOLE ON BOLT CATCH/RELEASE SUPPORT (576). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-38

FIGURE 2-66.

PLACE BOLT CATCH/RELEASE (578H) INTO BOLT CATCH/RELEASE SPRING (577) AND BOLT CATCH/RELEASE SUPPORT (576). . . . . . . . . . . . . . . . . 2-38

FIGURE 2-67.

PLACE 1/16” PIN PUNCH (UT2005) INTO BOLT CATCH/RELEASE (578H) AND BOLT CATCH/RELEASE SUPPORT (576).. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-38

FIGURE 2-68.

PLACE NEW SPRING-TYPE STRAIGHT PIN, SLOTTED (579) INTO 3S ROLL PIN HOLDER, 3/32” (UT2041). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-39

FIGURE 2-69.

FINISH DRIVING SPRING-TYPE STRAIGHT PIN, SLOTTED (579) WITH OVERSIZED 1/8” PIN PUNCH (UT2006). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-39 xi

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FIGURE 2-70.

USE 3S ROLL PIN HOLDER, 3/32” (UT2041) TO START SPRING-TYPE STRAIGHT PIN, SLOTTED (579). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-39

FIGURE 2-71.

ENSURE SPRING-TYPE STRAIGHT PIN, SLOTTED (579) IS FLUSH ON BOTH SIDES FOR FREE MOVEMENT OF BOLT CATCH/RELEASE (578L). . . . . . . . . . . . 2-39

FIGURE 2-72.

USING HAMMER (UT2115), LIGHTLY TAP BOLT CATCH/RELEASE SUPPORT (576) FROM LEFT SIDE OF TRIGGER MODULE, COMPLETE (501H) UNTIL SUPPORT IS SECURE.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-40

FIGURE 2-73.

ENSURE SPRING-TYPE STRAIGHT PIN, SLOTTED (579) IS FLUSH ON BOTH SIDES FOR FREE MOVEMENT OF BOLT CATCH/RELEASE (578H).. . . . . . . . . . . 2-40

FIGURE 2-74.

WITH AUTO SEAR SPRING HOOK TOOL (UT2828), PUSH SPRING, SEAR, AUTOMATIC (SPRING, SEAR, SAFETY) (580) FROM RIGHT TO LEFT TO RELEASE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-41

FIGURE 2-75.

WITH 1/8” PIN PUNCH (UT2006), PUSH BOLT CATCH/RELEASE SUPPORT (576) THROUGH AND OUT TO REMOVE. . . . . . . . . . . . . . . . . . . . . . . . 2-41

FIGURE 2-76.

REMOVE AUTOMATIC SEAR (581) AND SPRING, SEAR, AUTOMATIC (SPRING, SEAR, SAFETY) (580).. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-41

FIGURE 2-77.

INSPECT BOLT CATCH/RELEASE SUPPORT (576) FOR DISCREPANCIES. . . . . 2-42

FIGURE 2-78.

INSPECT SPRING, SEAR, AUTOMATIC (SPRING, SEAR, SAFETY) (580) AND AUTOMATIC SEAR (581) FOR DISCREPANCIES. . . . . . . . . . . . . . . . . . . . . . . . . . . 2-42

FIGURE 2-79.

INSTALL BOLT CATCH/RELEASE SUPPORT (576) HALF WAY INTO TRIGGER MODULE FRAME (511H). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-43

FIGURE 2-80.

INSTALL BOLT CATCH/RELEASE SUPPORT (576) HALF WAY INTO TRIGGER MODULE FRAME (511H). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-43

FIGURE 2-81.

ENSURE FLATS ARE INSTALLED CORRECTLY ON AUTOMATIC SEAR (581), BOLT CATCH/RELEASE SUPPORT (576), AND SPRING, SEAR, AUTOMATIC (SPRING, SEAR, SAFETY) (580).. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-44

FIGURE 2-82.

INSTALL SPRING, SEAR, AUTOMATIC (SPRING, SEAR, SAFETY) (580) AND AUTOMATIC SEAR (581) PROPERLY. INSTALL BOLT CATCH/RELEASE SUPPORT (576) INTO LEFT SIDE. ALIGN SPRING, SEAR, AUTOMATIC (SPRING, SEAR, SAFETY) AND AUTOMATIC SEAR WITH 1/8” PIN PUNCH (UT2006). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-44

FIGURE 2-83.

ALIGN AND PUSH THROUGH BOLT CATCH/RELEASE SUPPORT (576).. . . . . . . 2-45

FIGURE 2-84.

FIT SPRING, SEAR, AUTOMATIC (SPRING, SEAR, SAFETY) (580) ONTO BOLT CATCH/RELEASE SUPPORT (576) IN PROPER NOTCH. . . . . . . . . . . . . . . . . . . . . 2-45

FIGURE 2-85.

USE AUTO SEAR SPRING HOOK TOOL (UT2828) TO ENGAGE SPRING, SEAR, AUTOMATIC (SPRING, SEAR, SAFETY) (580) AROUND HOUSING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-45

FIGURE 2-86.

INSTALL BOLT CATCH/RELEASE SPRING (577). . . . . . . . . . . . . . . . . . . . . . . . . . . 2-46

FIGURE 2-87.

ALIGN BOLT CATCH/RELEASE (578H) WITH BOLT CATCH/RELEASE SPRING (577).. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-46 xii

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FIGURE 2-88.

ALIGN 1/16” PIN PUNCH (UT2006) FROM LEFT TO RIGHT. . . . . . . . . . . . . . . . . . . 2-46

FIGURE 2-89.

USE 2S ROLL PIN HOLDER, 5/64” (UT2042) TO HOLD SPRING-TYPE STRAIGHT PIN, SLOTTED (579).. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-46

FIGURE 2-90.

START SPRING-TYPE STRAIGHT PIN, SLOTTED (579) WITH 3S ROLL PIN STARTER. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-47

FIGURE 2-91.

DRIVE SPRING-TYPE STRAIGHT PIN, SLOTTED (579) INTO PLACE. . . . . . . . . . . 2-47

FIGURE 2-92.

USING HAMMER (UT2115), LIGHTLY TAP BOLT CATCH/RELEASE SUPPORT (576) FROM LEFT SIDE OF TRIGGER MODULE UNTIL SUPPORT IS SECURE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-47

FIGURE 2-93.

ENSURE PROPER INSTALLATION BY CHECKING FOR SPRING TENSION ON BOLT CATCH/RELEASE SUPPORT (576) AND AUTOMATIC SEAR (581). . . . . 2-47

FIGURE 2-94.

APPLY PRESSURE ONTO HAMMER SPRING (558) AND HAMMER SPRING GUIDE (559) WHILE REMOVING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-48

FIGURE 2-95.

REMOVE HAMMER SPRING (558) AND HAMMER SPRING GUIDE (559) FROM TRIGGER MODULE FRAME (511H). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-48

FIGURE 2-96.

INSPECT HAMMER SPRING GUIDE (559). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-49

FIGURE 2-97.

INSPECT HAMMER SPRING (558). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-49

FIGURE 2-98.

ENSURE TIP OF HAMMER SPRING (558) IS ON SHOULDER OF HAMMER SPRING GUIDE (559). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-50

FIGURE 2-99.

FIT HAMMER SPRING (558) AND HAMMER SPRING GUIDE (559) INTO HAMMER SPRING SUPPORT (557). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-50

FIGURE 2-100.

USE 1/8” PIN PUNCH (UT2006), AND HOLD HAMMER SPRING (558) AND HAMMER SPRING GUIDE (559) WHILE PUSHING BACK. . . . . . . . . . . . . . . . . . . . . 2-50

FIGURE 2-101.

FIT HAMMER SPRING (558) AND HAMMER SPRING GUIDE (559) INTO LUG OF HAMMER (555). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-50

FIGURE 2-102.

USE SCREWDRIVER (UT1905) TO REMOVE SCREW FROM SELECTOR LEVER, SHORT (571).. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-51

FIGURE 2-103.

REMOVE SELECTOR LEVER, SHORT (571) FROM TRIGGER MODULE FRAME (511H). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-51

FIGURE 2-104.

REMOVE SELECTOR LEVER ASSEMBLY (565) FROM TRIGGER MODULE FRAME (511H). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-51

FIGURE 2-105.

REMOVE SELECTOR LEVER DETENT (516) FROM TRIGGER MODULE FRAME (511H). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-52

FIGURE 2-106.

REMOVE SELECTOR LEVER DETENT SPRING (515) FROM TRIGGER MODULE FRAME (511H). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-52

FIGURE 2-107.

INSPECT SELECTOR LEVER (567) AND SELECTOR LEVER, SHORT (571) FOR DISCREPANCIES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-53

FIGURE 2-108.

INSPECT SELECTOR LEVER (567) FOR DISCREPANCIES. . . . . . . . . . . . . . . . . . . 2-53 xiii

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FIGURE 2-109.

INSPECT SELECTOR LEVER DETENT (516) AND SELECTOR LEVER DETENT SPRING (515) FOR DISCREPANCIES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-53

FIGURE 2-110.

INSTALL SELECTOR LEVER FIXING SCREW (568) INTO SELECTOR LEVER (567).. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-54

FIGURE 2-111.

INSTALL SELECTOR LEVER DETENT SPRING (515) ON TRIGGER MODULE FRAME (511H). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-55

FIGURE 2-112.

INSTALL SELECTOR LEVER DETENT (516) ON TRIGGER MODULE FRAME (511H). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-55

FIGURE 2-113.

INSTALL SELECTOR LEVER ASSEMBLY (565) ON TRIGGER MODULE FRAME (511H). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-55

FIGURE 2-114.

INSTALL SELECTOR LEVER FIXING SCREW (568) INTO SELECTOR LEVER, SHORT (571). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-56

FIGURE 2-115.

SCREW SELECTOR LEVER FIXING SCREW (568) INTO SELECTOR LEVER ASSEMBLY.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-56

FIGURE 2-116.

REMOVE LOCKING PLATE (569) FROM TRIGGER MODULE FRAME (511H). . . . 2-57

FIGURE 2-117.

REMOVE HAMMER SPRING SUPPORT (557) FROM TRIGGER MODULE FRAME (511H). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-57

FIGURE 2-118.

REMOVE HAMMER PIN (556).. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-57

FIGURE 2-119.

REMOVE HAMMER PIN (556) AND HAMMER (555) FROM TRIGGER MODULE FRAME (511H). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-57

FIGURE 2-120.

INSPECT LOCKING PLATE (569) FOR DISCREPANCIES. . . . . . . . . . . . . . . . . . . . 2-58

FIGURE 2-121.

INSPECT HAMMER SPRING SUPPORT (557) FOR DISCREPANCIES. . . . . . . . . . 2-58

FIGURE 2-122.

INSPECT HAMMER PIN (556) AND HAMMER (555) FOR DISCREPANCIES.. . . . . 2-58

FIGURE 2-123.

INSTALL HAMMER PIN (556) AND HAMMER (555) INTO TRIGGER MODULE FRAME (511H). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-59

FIGURE 2-124.

INSTALL HAMMER SPRING SUPPORT (557) INTO TRIGGER MODULE FRAME (511H). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-59

FIGURE 2-125.

INSERT LOCKING PLATE FORK INTO LOCKING PLATE (569). . . . . . . . . . . . . . . . 2-59

FIGURE 2-126.

INSTALL LOCKING PLATE (569) INTO TRIGGER MODULE FRAME (511H). . . . . . 2-59

FIGURE 2-127.

APPLY DOWNWARD PRESSURE, AND START 1/8” PIN PUNCH (UT2006). . . . . . 2-60

FIGURE 2-128.

REMOVE TRIGGER PIN (548) FROM LEFT SIDE OF TRIGGER MODULE FRAME (511H). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-60

FIGURE 2-129.

REMOVE SEAR (547), SEAR SPRING (546), TRIGGER (545), AND TRIGGER RETURN SPRING (521).. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-60

FIGURE 2-130.

INSPECT SEAR SPRING (546) AND TRIGGER RETURN SPRING (521) FOR DISCREPANCIES.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-61

FIGURE 2-131.

INSPECT TRIGGER (545) AND SEAR (547) FOR DISCREPANCIES. . . . . . . . . . . . 2-61 xiv

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FIGURE 2-132.

INSERT SEAR SPRING (546) INTO TRIGGER (545). . . . . . . . . . . . . . . . . . . . . . . . . 2-62

FIGURE 2-133.

INSERT SEAR (547) ONTO SEAR SPRING (546).. . . . . . . . . . . . . . . . . . . . . . . . . . . 2-62

FIGURE 2-134.

START TO INSERT MOUNTING AXIS, TRIGGER (SPT888A) THROUGH TRIGGER RETURN SPRING (521) AND TRIGGER (545). . . . . . . . . . . . . . . . . . . . . . 2-62

FIGURE 2-135.

FINISH PUSHING MOUNTING AXIS, TRIGGER (SPT888A) COMPLETELY THROUGH WITH EVEN AMOUNT OF MOUNTING AXIS, TRIGGER SHOWING. . . 2-62

FIGURE 2-136.

COMPLETED TRIGGER (545), SEAR SPRING (546), AND TRIGGER RETURN SPRING (521) ASSEMBLED WITH MOUNTING AXIS, TRIGGER (SPT888A). . . . . . 2-63

FIGURE 2-137.

PUSH TRIGGER PIN (548) THROUGH TRIGGER MODULE FRAME (511H), AND RELEASE MOUNTING AXIS, TRIGGER (SPT888A). . . . . . . . . . . . . . . . . . . . . . . . . . 2-63

FIGURE 2-138.

INVERT TRIGGER MODULE FRAME (511H), AND REMOVE SPRING-TYPE STRAIGHT PIN, SLOTTED (535). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-64

FIGURE 2-139.

ENSURE MAGAZINE CATCH/RELEASE LEVER, RIGHT (537) IS RETAINED WHEN REMOVING 1/16” PIN PUNCH (UT2005). . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-64

FIGURE 2-140.

REMOVE SPRING, MAGAZINE CATCH/RELEASE (539) AND MAGAZINE CATCH/ RELEASE LEVER, RIGHT (537).. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-65

FIGURE 2-141.

REMOVE MAGAZINE CATCH/RELEASE BODY (532H).. . . . . . . . . . . . . . . . . . . . . . 2-65

FIGURE 2-142.

INSPECT MAGAZINE CATCH/RELEASE LEVER, RIGHT (537), SPRING, MAGAZINE CATCH/RELEASE (539), MAGAZINE CATCH/RELEASE BODY (532H), AND MAGAZINE CATCH/RELEASE LEVER, LEFT (534) FOR DISCREPANCIES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-66

FIGURE 2-143.

INSERT MAGAZINE CATCH/RELEASE BODY (532H) INTO TRIGGER MODULE FRAME (511H). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-67

FIGURE 2-144.

INSERT LEADING EDGE OF SPRING-TYPE STRAIGHT PIN, SLOTTED (535). . . . 2-67

FIGURE 2-145.

INSERT SPRING-TYPE STRAIGHT PIN, SLOTTED (535) INTO MAGAZINE CATCH/RELEASE LEVER, RIGHT (537). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-67

FIGURE 2-146.

INSERT SPRING, MAGAZINE CATCH/RELEASE (539) AND MAGAZINE CATCH/RELEASE LEVER, RIGHT (537) WITH SPRING-TYPE STRAIGHT PIN, SLOTTED (535) INTO TRIGGER MODULE FRAME (511H). . . . . . . . . . . . . . . . 2-68

FIGURE 2-147.

DRIVE SPRING-TYPE STRAIGHT PIN, SLOTTED (535) INTO MAGAZINE CATCH/RELEASE LEVER, RIGHT (537). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-68

FIGURE 2-148.

USE HAMMER (UT2115) TO DRIVE FLUSH SPRING-TYPE STRAIGHT PIN, SLOTTED (535) IN MAGAZINE CATCH/RELEASE LEVER, RIGHT (537). . . . . . . . . 2-68

FIGURE 2-149.

BUTTSTOCK MODULE.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-70

FIGURE 2-150.

INSTALL BUTTSTOCK MODULE (800) INTO VISE WITH 4” X 6” LEATHER PAD SET (UT2833). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-71

FIGURE 2-151.

REMOVE BUTTPLATE (878). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-71

FIGURE 2-152.

REMOVE CLIP, RETAINING (513). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-71 xv

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FIGURE 2-153.

INSPECT BUTTPLATE (878). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-72

FIGURE 2-154.

INSPECT TAKEDOWN PIN, BUTTPLATE (879). . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-72

FIGURE 2-155.

INSPECT CLIP, RETAINING (513). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-72

FIGURE 2-156.

INSTALL TAKEDOWN PIN, BUTTPLATE (879). . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-73

FIGURE 2-157.

INSTALL CLIP, RETAINING (513). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-73

FIGURE 2-158.

INSTALL BUTTPLATE (878), AND PUSH IN TAKEDOWN PIN, BUTTPLATE (879) ALL THE WAY. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-73

FIGURE 2-159.

USE TORQUE SCREWDRIVER (UT1937) AND ADAPTER, 4 MM (UT2381) TO REMOVE HEXAGON SOCKET HEAD CAP SCREW (853). . . . . . . . . . . . . . . . . . . . 2-74

FIGURE 2-160.

REMOVE LOP LOCK (866) FROM BUTTSTOCK REAR SUPPORT (860).. . . . . . . . 2-74

FIGURE 2-161.

CONTINUE TO ROTATE LOP LOCK (866) CW, AND REMOVE FROM BUTTSTOCK REAR SUPPORT (860). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-74

FIGURE 2-162.

REMOVE COUNTERSUNK HEAD RIVET (869) TO DISASSEMBLE LOP LOCK (866).. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-74

FIGURE 2-163.

REMOVE BUTTSTOCK REAR SUPPORT (860) FROM BUTTSTOCK MODULE BLOCK (810). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-75

FIGURE 2-164.

UNSCREW HEXAGON SOCKET HEAD CAP SCREW (853). . . . . . . . . . . . . . . . . . . 2-75

FIGURE 2-165.

REMOVE ADJUSTMENT LOP WASHER (870) FROM LOP ADJUSTING SCREW SUPPORT (851).. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-75

FIGURE 2-166.

INSPECT HEXAGON SOCKET HEAD CAP SCREW (853) FOR DISCREPANCIES.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-76

FIGURE 2-167.

INSPECT LOP LOCK (866), SPRING, LOP LOCK (867), AND COUNTERSUNK HEAD RIVET (869) FOR DISCREPANCIES. . . . . . . . . . . . . . . . . . 2-76

FIGURE 2-168.

INSPECT BUTTSTOCK REAR SUPPORT (860) FOR DISCREPANCIES. . . . . . . . . 2-76

FIGURE 2-169.

INSPECT LOP ADJUSTING SCREW SUPPORT (851) FOR DISCREPANCIES. . . . 2-77

FIGURE 2-170.

INSPECT LOP ADJUSTING SCREW (852) FOR DISCREPANCIES. . . . . . . . . . . . . 2-77

FIGURE 2-171.

FIT LOP ADJUSTING SCREW (852) AND LOP ADJUSTING SCREW SUPPORT (851) TOGETHER. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-78

FIGURE 2-172.

INSTALL LOP ADJUSTING SCREW SUPPORT (851) INTO BUTTSTOCK MODULE BLOCK (810). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-78

FIGURE 2-173.

START HEXAGON SOCKET HEAD CAP SCREW (853) INTO BUTTSTOCK MODULE BLOCK (810). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-78

FIGURE 2-174.

USE TORQUE SCREWDRIVER (UT1937) TO TIGHTEN HEXAGON SOCKET HEAD CAP SCREW (853) TO PROPER TORQUE. . . . . . . . . . . . . . . . . . . . . . . . . . . 2-78

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FIGURE 2-175.

FIT ADJUSTMENT LOP WASHER (870) ONTO LOP ADJUSTING SCREW (852). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-79

FIGURE 2-176.

FIT BUTTSTOCK REAR SUPPORT (860) OVER LOP ADJUSTING SCREW SUPPORT (851). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-79

FIGURE 2-177.

INSTALL SPRING, LOP LOCK (867) INTO LOP LOCK (866). . . . . . . . . . . . . . . . . . . 2-80

FIGURE 2-178.

SPRING, LOP LOCK (867) LEGS BEING COMPRESSED. . . . . . . . . . . . . . . . . . . . . 2-80

FIGURE 2-179.

FIT LOP LOCK (866) ONTO LOP ADJUSTING SCREW (852). . . . . . . . . . . . . . . . . . 2-80

FIGURE 2-180.

TORQUE HEXAGON SOCKET HEAD CAP SCREW (853) TO PROPER SETTING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-81

FIGURE 2-181.

OPEN BUTTSTOCK HINGE PLATE (801) BY PUSHING BUTTSTOCK LOCK SPRING (811). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-82

FIGURE 2-182.

PIVOT REAR RIGHT CORNER OF CHEEK REST (856) OFF ITS LUG. . . . . . . . . . . 2-82

FIGURE 2-183.

USE SCREWDRIVER (UT1905) TO RELEASE LEFT SIDE OF CHEEK REST (856). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-83

FIGURE 2-184.

ROTATE CHEEK REST (856) TOWARDS ADJUSTING BUTTON, CHEEK REST (857). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-83

FIGURE 2-185.

INSPECT CHEEK REST (856) FOR DISCREPANCIES.. . . . . . . . . . . . . . . . . . . . . . . 2-84

FIGURE 2-186.

INSPECT ADJUSTING BUTTON, CHEEK REST (857) FOR DISCREPANCIES.. . . . 2-84

FIGURE 2-187.

INSPECT SPRING, CHEEK REST (858) AND CHEEK REST PIN (859) FOR DISCREPANCIES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-84

FIGURE 2-188.

FIT SPRING, CHEEK REST (858) INTO CHEEK REST PIN (859). . . . . . . . . . . . . . . 2-85

FIGURE 2-189.

FIT CHEEK REST PIN (859) AND SPRING, CHEEK REST (858) INTO ADJUSTING BUTTON, CHEEK REST (857). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-85

FIGURE 2-190.

INSTALL ADJUSTING BUTTON, CHEEK REST (857), CHEEK REST PIN (859), AND SPRING, CHEEK REST (858) INTO BUTTSTOCK MODULE BLOCK (810). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-85

FIGURE 2-191.

SET CHEEK REST (856) OVER BUTTSTOCK MODULE BLOCK (810) WHILE PUSHING ADJUSTING BUTTON, CHEEK REST (857) AND CHEEK REST PIN (859) INWARD. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-86

FIGURE 2-192.

SNAP CHEEK REST (856) OVER ADJUSTING BUTTON, CHEEK REST (857) AND CHEEK REST PIN (859).. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-86

FIGURE 2-193.

LOCK CHEEK REST (856) HOLES ONTO CORRESPONDING LUGS ON BUTTSTOCK MODULE BLOCK (810). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-86

FIGURE 2-194.

UNLOCK BUTTSTOCK LOCK (812) FROM BUTTSTOCK HINGE PLATE (801). . . . 2-87

FIGURE 2-195.

PUSH IN ON LUG TO RELEASE BUTTSTOCK LOCK (812) FROM BUTTSTOCK MODULE BLOCK (810). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-87

FIGURE 2-196.

REMOVE BUTTSTOCK LOCK SPRING (811) AND BUTTSTOCK LOCK (812) FROM BUTTSTOCK MODULE BLOCK (810). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-87 xvii

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FIGURE 2-197.

INSPECT BUTTSTOCK LOCK (812) FOR DISCREPANCIES. . . . . . . . . . . . . . . . . . 2-88

FIGURE 2-198.

INSPECT BUTTSTOCK LOCK SPRING (811) FOR DISCREPANCIES. . . . . . . . . . . 2-88

FIGURE 2-199.

INSPECT BUTTSTOCK HINGE PLATE (801) AND BUTTSTOCK MODULE BLOCK (810) FOR DISCREPANCIES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-88

FIGURE 2-200.

INSPECT HINGE PLATE BRIDGE FOR EXCESSIVE DEFORMATION OF MATERIAL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-88

FIGURE 2-201.

FIT BUTTSTOCK LOCK SPRING (811) AND BUTTSTOCK LOCK (812) TOGETHER. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-89

FIGURE 2-202.

PUSH BUTTSTOCK LOCK (812) AND BUTTSTOCK LOCK SPRING (811) INTO BUTTSTOCK MODULE BLOCK (810). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-89

FIGURE 2-203.

PUSH BUTTSTOCK LOCK (812) IN AND OUT TO TEST FOR FUNCTION.. . . . . . . 2-89

FIGURE 2-204.

MOVING PARTS ASSEMBLY. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-91

FIGURE 2-205.

INSPECT BOLT CARRIER (411H) AND RETURN SPRING ASSEMBLY (440H) FOR DISCREPANCIES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-93

FIGURE 2-206.

INSPECT FIRING PIN (431H) FOR DISCREPANCIES. . . . . . . . . . . . . . . . . . . . . . . . 2-93

FIGURE 2-207.

INSPECT FIRING PIN RETAINING PIN ASSEMBLY (435) FOR DISCREPANCIES.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-93

FIGURE 2-208.

INSPECT CHARGING HANDLE (450) AND BOLT CAM PIN (430) FOR DISCREPANCIES.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-93

FIGURE 2-209.

INSTALL BOLT ASSEMBLY (420L) INTO VISE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-95

FIGURE 2-210.

USE 1/16” PIN PUNCH (UT2005) TO REMOVE EXTRACTOR PIN (425). . . . . . . . . 2-95

FIGURE 2-211.

REMOVE RETAINING RING, EXTRACTOR PIN (RETAINING RING, ANTERIOR STOP) (429). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-96

FIGURE 2-212.

REMOVE EXTRACTOR (424H), SPRING, EXTRACTOR (422), AND EXTRACTOR PLUNGER (423). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-96

FIGURE 2-213.

FIT BOLT ASSEMBLY (420H) INTO BLOCK, BOLT MAINTENANCE (UT1834) ENSURING PROPER ORIENTATION OF TOOL, EJECTOR REMOVAL (SPT850). PLACE ARM, BOLT MAINTENANCE BLOCK (UT1835) ONTO CORRESPONDING HINGE TO CAPTURE BOTH BOLT ASSEMBLY AND TOOL, EJECTOR REMOVAL.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-96

FIGURE 2-214.

SECURE INTO VISE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-96

FIGURE 2-215.

DRIVE OUT AND REMOVE SPRING-TYPE STRAIGHT PIN, SLOTTED (428). . . . . 2-97

FIGURE 2-216.

REMOVE 1/16” PIN PUNCH (UT2005) WHILE RELEASING SPRING TENSION. . . 2-97

FIGURE 2-217.

INSPECT BOLT ASSEMBLY (420H) FOR DISCREPANCIES.. . . . . . . . . . . . . . . . . . 2-98

FIGURE 2-218.

INSPECT EXTRACTOR PLUNGER (423) AND SPRING, EXTRACTOR (422) FOR DISCREPANCIES.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-98

FIGURE 2-219.

INSPECT EXTRACTOR (424H) FOR DISCREPANCIES. . . . . . . . . . . . . . . . . . . . . . 2-98 xviii

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FIGURE 2-220.

INSPECT SPRING, EJECTOR (427) FOR DISCREPANCIES. . . . . . . . . . . . . . . . . . . 2-99

FIGURE 2-221.

INSPECT EJECTOR (426) FOR DISCREPANCIES.. . . . . . . . . . . . . . . . . . . . . . . . . . 2-99

FIGURE 2-222.

PROPERLY INSTALL BOLT ASSEMBLY (420H) INTO VISE. . . . . . . . . . . . . . . . . . 2-100

FIGURE 2-223.

FIT EXTRACTOR PLUNGER (423) AND SPRING, EXTRACTOR (422) INTO EXTRACTOR (424H).. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-100

FIGURE 2-224.

INSTALL EXTRACTOR (424H) AND EXTRACTOR PIN (425) INTO BOLT ASSEMBLY (420H). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-100

FIGURE 2-225.

WHILE HOLDING RIGHT SIDE OF EXTRACTOR PIN (425) IN PLACE WITH 1/8” PIN PUNCH (UT2006), PLACE NEW RETAINING RING, EXTRACTOR PIN (RETAINING RING, ANTERIOR STOP) (429) ONTO LEFT SIDE OF EXTRACTOR PIN.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-101

FIGURE 2-226.

SNAP RETAINING RING, EXTRACTOR PIN (RETAINING RING, ANTERIOR STOP) (429) ONTO EXTRACTOR PIN (425) USING 2S ROLL PIN HOLDER, 5/64” (UT2042). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-101

FIGURE 2-227.

FIT EJECTOR (426) SQUARE TIP FIRST INTO EJECTOR HOLE LOCATED ON REAR OF BOLT ASSEMBLY (420H). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-102

FIGURE 2-228.

PLACE SPRING, EJECTOR (427) INTO BOLT ASSEMBLY (420H). . . . . . . . . . . . . 2-102

FIGURE 2-229.

PLACE BOLT ASSEMBLY INTO BLOCK, BOLT MAINTENANCE (UT1834) ALONG WITH TOOL, EJECTOR REMOVAL (SPT850); TIGHTEN UNTIL 1/16" PIN PUNCH (UT2008) CAN BE REMOVED. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-102

FIGURE 2-230.

PLACE NEW SPRING-TYPE STRAIGHT PIN, SLOTTED (428) INTO 3S ROLL PIN HOLDER, 3/32” (UT2041). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-103

FIGURE 2-231.

START NEW SPRING-TYPE STRAIGHT PIN, SLOTTED (428) INTO BOLT ASSEMBLY (420L). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-104

FIGURE 2-232.

FINISH DRIVING PIN WITH 1/16” PIN PUNCH (UT2005). . . . . . . . . . . . . . . . . . . . . 2-104

FIGURE 2-233.

TEST FUNCTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-104

FIGURE 2-234.

COMPLETE RECEIVER ASSEMBLY. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-107

FIGURE 2-235.

LOOSEN FORWARD BARREL EXTENSION SCREWS (231) X2. . . . . . . . . . . . . . . 2-108

FIGURE 2-236.

LOOSEN REAR BARREL EXTENSION SCREWS (231) X4. . . . . . . . . . . . . . . . . . . 2-108

FIGURE 2-237.

REMOVE BARREL ASSEMBLY. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-109

FIGURE 2-238.

INSPECT COMPLETE BARREL ASSEMBLY (S) (010H-S) FOR CRACKS, BURRS, UNUSUAL WEAR, STRIPPED THREADS, AND STRAIGHTNESS. . . . . . 2-110

FIGURE 2-239.

INSTALL COMPLETE BARREL ASSEMBLY (S) (010H-S). . . . . . . . . . . . . . . . . . . . 2-111

FIGURE 2-240.

ALIGN BARREL EXTENSION SCREWS (231) X6 IN COMPLETE BARREL ASSEMBLY (S) (010H-S). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-111

FIGURE 2-241.

TIGHTEN REAR BARREL EXTENSION SCREWS (231) X4.. . . . . . . . . . . . . . . . . . 2-112

FIGURE 2-242.

TIGHTEN FORWARD BARREL EXTENSION SCREWS (231) X2.. . . . . . . . . . . . . . 2-112 xix

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FIGURE 2-243.

BARREL CONFIGURATIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-113

FIGURE 2-244.

INSTALL BARREL VISE JAWS INTO VISE.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-114

FIGURE 2-245.

INSTALL COMPLETE BARREL ASSEMBLY (S) (010H-S) INTO BLOCK, RECEIVER AND BARREL RIGHT VISE (UT1832) AND BLOCK, RECEIVER AND BARREL LEFT VISE (UT1833). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-114

FIGURE 2-246.

REMOVE FLASH HIDER (138H). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-114

FIGURE 2-247.

INSPECT FLASH HIDER (138H) FOR DISCREPANCIES.. . . . . . . . . . . . . . . . . . . . 2-115

FIGURE 2-248.

INSPECT BARREL CROWN FOR DISCREPANCIES. . . . . . . . . . . . . . . . . . . . . . . . 2-115

FIGURE 2-249.

USE SCRAPER TOOL TO REMOVE EXCESSIVE CARBON BUILDUP FROM MUZZLE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-116

FIGURE 2-250.

APPLY ROCKSETT (822/5) ONTO THREADED AREA OF MUZZLE. . . . . . . . . . . . 2-117

FIGURE 2-251.

INSTALL FLASH HIDER (138H).. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-117

FIGURE 2-252.

TIGHTEN FLASH HIDER (138H) TO PROPER TORQUE.. . . . . . . . . . . . . . . . . . . . 2-117

FIGURE 2-253.

MOUNT LOWER RAIL (117) INTO CORRESPONDING BLOCK, RECEIVER AND BARREL RIGHT/LEFT VISE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-118

FIGURE 2-254.

UNLOCK GAS REGULATOR (129). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-118

FIGURE 2-255.

REMOVE GAS REGULATOR (129).. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-118

FIGURE 2-256.

DRIVE OUT SPRING-TYPE STRAIGHT PIN, SLOTTED (128).. . . . . . . . . . . . . . . . 2-119

FIGURE 2-257.

LEAVE 1/16” PIN PUNCH (UT2005) IN PLACE.. . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-119

FIGURE 2-258.

REMOVE 1/16” PIN PUNCH (UT2005). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-119

FIGURE 2-259.

REMOVE PLUNGER, PLUG, GAS (127) AND SPRING, PLUNGER, PLUG, GAS (126). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-119

FIGURE 2-260.

USE 1/8” PIN PUNCH (UT2006) TO FREE GAS PISTON ASSEMBLY (120).. . . . . 2-120

FIGURE 2-261.

REMOVE GAS PISTON ASSEMBLY (120). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-120

FIGURE 2-262.

INSPECT GAS PISTON ASSEMBLY (120) FOR DISCREPANCIES.. . . . . . . . . . . . 2-121

FIGURE 2-263.

INSPECT SPRING, PLUNGER, PLUG, GAS (126) AND PLUNGER, PLUG, GAS (127) FOR DISCREPANCIES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-121

FIGURE 2-264.

INSPECT GAS REGULATOR (129) FOR DISCREPANCIES. . . . . . . . . . . . . . . . . . 2-121

FIGURE 2-265.

INSTALL RING, PISTON (122) X3.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-122

FIGURE 2-266.

INSTALL RING, PISTON (122) X3.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-122

FIGURE 2-267.

POSITION RING, PISTON (122) X3.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-123

FIGURE 2-268.

PROPER POSITION OF RING, PISTON (122) X3. . . . . . . . . . . . . . . . . . . . . . . . . . 2-123

FIGURE 2-269.

INSTALL GAS PISTON ASSEMBLY (120).. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-123

FIGURE 2-270.

LUBRICATE SPRING, PLUNGER, PLUG, GAS (126) HOUSING. . . . . . . . . . . . . . . 2-124

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FIGURE 2-271.

INSTALL SPRING, PLUNGER, PLUG, GAS (126) AND PLUNGER, PLUG, GAS (127) INTO HOUSING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-124

FIGURE 2-272.

SLIGHTLY INSERT LEADING EDGE OF NEW SPRING-TYPE STRAIGHT PIN, SLOTTED (128).. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-125

FIGURE 2-273.

HOLD IN PLUNGER, PLUG, GAS (127), AND INSTALL GAS REGULATOR (129). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-125

FIGURE 2-274.

INSTALL NEW SPRING-TYPE, STRAIGHT PIN, SLOTTED (128) USING 2S ROLL PIN HOLDER, 5/64” (UT2042). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-125

FIGURE 2-275.

INSTALL NEW SPRING-TYPE STRAIGHT PIN, SLOTTED (128).. . . . . . . . . . . . . . 2-126

FIGURE 2-276.

UNSCREW AND REMOVE FRONT SIGHT POST (188). . . . . . . . . . . . . . . . . . . . . . 2-127

FIGURE 2-277.

REMOVE INDEX, FRONT SIGHT POST (187).. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-127

FIGURE 2-278.

REMOVE SPRING, INDEX, FRONT SIGHT POST (186).. . . . . . . . . . . . . . . . . . . . . 2-127

FIGURE 2-279.

REMOVE SPRING-TYPE STRAIGHT PIN, SLOTTED (428). . . . . . . . . . . . . . . . . . . 2-128

FIGURE 2-280.

REMOVE WINDAGE SCREW RETAINING WHEEL (152).. . . . . . . . . . . . . . . . . . . . 2-128

FIGURE 2-281.

USE TORQUE SCREWDRIVER (UT1937) TO LOOSEN FRONT SIGHT ASSEMBLY (140). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-129

FIGURE 2-282.

REMOVE FRONT SIGHT ASSEMBLY (140). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-129

FIGURE 2-283.

REMOVE SPRING, FRONT SIGHT BLOCK (149), FRONT SIGHT WINDAGE SCREW (151), INDEX, WINDAGE WHEEL (155), AND SPRING, INDEX WINDAGE (148). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-130

FIGURE 2-284.

INSPECT FRONT SIGHT POST (188), INDEX, FRONT SIGHT POST (187), AND SPRING, INDEX, FRONT SIGHT POST (186) FOR DISCREPANCIES. . . . . . . . . . 2-131

FIGURE 2-285.

INSPECT FRONT SIGHT ASSEMBLY (140) FOR DISCREPANCIES.. . . . . . . . . . . 2-131

FIGURE 2-286.

INSPECT FRONT SIGHT WINDAGE SCREW (151), WINDAGE SCREW RETAINING WHEEL (152), AND SPRING, FRONT SIGHT BLOCK (149) FOR DISCREPANCIES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-132

FIGURE 2-287.

INSPECT INDEX, WINDAGE WHEEL (155) AND SPRING, INDEX WINDAGE (148) FOR DISCREPANCIES.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-132

FIGURE 2-288.

INSPECT GAS BLOCK DOVETAIL SLOTS FOR DISCREPANCIES.. . . . . . . . . . . . 2-133

FIGURE 2-289.

INSERT SPRING, INDEX WINDAGE (148), INDEX, WINDAGE WHEEL (155), AND FRONT SIGHT WINDAGE SCREW (151). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-134

FIGURE 2-290.

INSERT SPRING, FRONT SIGHT BLOCK (149) ONTO FRONT SIGHT WINDAGE SCREW (151), AND INSTALL FRONT SIGHT ASSEMBLY (140). . . . . . 2-135

FIGURE 2-291.

INSERT WINDAGE SCREW RETAINING WHEEL (152) ONTO FRONT SIGHT WINDAGE SCREW (151). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-136

FIGURE 2-292.

INSERT SPRING, INDEX, FRONT SIGHT POST (186), INDEX, FRONT SIGHT POST (187), AND FRONT SIGHT POST (188). . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-137 xxi

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FIGURE 2-293.

USE HEAT GUN (UT2832) TO HEAT LOWER RAIL SCREW (119).. . . . . . . . . . . . 2-138

FIGURE 2-294.

SET TORQUE SCREWDRIVER (UT1937), AND LOOSEN LOWER RAIL SCREW (119) X2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-139

FIGURE 2-295.

INSPECT LOWER RAIL SCREW (119) X2 FOR DISCREPANCIES. . . . . . . . . . . . . 2-140

FIGURE 2-296.

INSPECT LOWER RAIL (117) AND LOWER BARREL SUPPORT (114) FOR DISCREPANCIES.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-140

FIGURE 2-297.

INSPECT BARREL EXTENSION FOR DISCREPANCIES. . . . . . . . . . . . . . . . . . . . 2-141

FIGURE 2-298.

INSTALL LOWER BARREL SUPPORT (114) INTO LOWER RAIL (117). . . . . . . . . 2-142

FIGURE 2-299.

INSTALL LOWER RAIL (117) ONTO BARREL EXTENSION. . . . . . . . . . . . . . . . . . 2-142

FIGURE 2-300.

APPLY LOCTITE 603 (SPT894/2) ONTO LOWER RAIL SCREW (119) X2 AND HAND-TIGHTEN INTO LOWER RAIL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-143

FIGURE 2-301.

INSTALL LOWER RAIL SCREW (119) X2 AND LOWER RAIL (117) USING TORQUE SCREWDRIVER (UT1937). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-143

FIGURE 2-302.

INSTALL RECEIVER BLOCK INTO VISE, AND SECURE RECEIVER ASSEMBLY (210H).. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-144

FIGURE 2-303.

USE HEAT GUN (UT2832) TO HEAT PLATE, FRONT (214). . . . . . . . . . . . . . . . . . 2-144

FIGURE 2-304.

LOOSEN AND REMOVE HEX SOCKET COUNTERSUNK HEAD SCREW, LARGE (217) X2, AND REMOVE PLATE, FRONT (214).. . . . . . . . . . . . . . . . . . . . . 2-145

FIGURE 2-305.

INSPECT HEX SOCKET COUNTERSUNK HEAD SCREW, LARGE (217) X2 AND PLATE, FRONT (214) FOR DISCREPANCIES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-146

FIGURE 2-306.

INSPECT RECEIVER ASSEMBLY (210H).. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-146

FIGURE 2-307.

INSTALL PLATE, FRONT (214). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-147

FIGURE 2-308.

APPLY LOCTITE 603 (SPT894/2) ONTO HEX SOCKET COUNTERSUNK HEAD SCREW, LARGE (217) X2, AND HAND-TIGHTEN THROUGH RECEIVER ASSEMBLY (210H) INTO PLATE, FRONT (214).. . . . . . . . . . . . . . . . . . . . . . . . . . . 2-147

FIGURE 2-309.

TIGHTEN HEX SOCKET COUNTERSUNK HEAD SCREW, LARGE (217) X2 USING TORQUE SCREWDRIVER (UT1937). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-148

FIGURE 2-310.

USE HEAT GUN (UT2832) TO HEAT HEX SOCKET COUNTERSUNK HEAD SCREW, LARGE (217) X2 FROM INSIDE OF RECEIVER ASSEMBLY (210H). . . . 2-149

FIGURE 2-311.

LOOSEN AND REMOVE HEX SOCKET COUNTERSUNK HEAD SCREW, LARGE (217) X2, AND REMOVE RECEIVER SIDE RAIL (239) FROM RECEIVER ASSEMBLY (210H). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-149

FIGURE 2-312.

REMOVE SPRING, SCREW (222) AND BARREL EXTENSION SCREW (231) FROM RECEIVER SIDE RAIL (239). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-150

FIGURE 2-313.

REMOVE NUT, SIDE RAIL (FOR 217) (224).. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-150

FIGURE 2-314.

REMOVE BLOCK, SIDE RAIL (213). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-151

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FIGURE 2-315.

INSPECT HEX SOCKET COUNTERSUNK HEAD SCREW, LARGE (217) X4, BARREL EXTENSION SCREW (231), RECEIVER SIDE RAIL (239), NUT, SIDE RAIL (FOR 217) (224), BLOCK, SIDE RAIL (213), AND SPRING, SCREW (222). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-152

FIGURE 2-316.

INSPECT RECEIVER ASSEMBLY (210H). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-152

FIGURE 2-317.

INSTALL BLOCK, SIDE RAIL (213). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-153

FIGURE 2-318.

INSTALL NUT, SIDE RAIL (FOR 217) (224).. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-153

FIGURE 2-319.

INSTALL BARREL EXTENSION SCREW (231) AND SPRING, SCREW (222). . . . . 2-154

FIGURE 2-320.

INSTALL RECEIVER SIDE RAIL (239).. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-154

FIGURE 2-321.

TIGHTEN HEX SOCKET COUNTERSUNK HEAD SCREW, LARGE (217) X4 WITH TORQUE SCREWDRIVER (UT1937). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-155

FIGURE 2-322.

USE HEAT GUN (UT2832) TO LOOSEN HEX SOCKET COUNTERSUNK HEAD SCREW, SMALL (219) X2.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-156

FIGURE 2-323.

LOOSEN AND UNSCREW HEX SOCKET COUNTERSUNK HEAD SCREW, SMALL (219) WITH TORQUE SCREWDRIVER (UT1937), AND REMOVE SUPPORT, SCREW (221).. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-157

FIGURE 2-324.

REMOVE SPRING, SCREW (222) X2 AND BARREL EXTENSION SCREW (231) X2.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-158

FIGURE 2-325.

REMOVE NUT, SUPPORT, SCREW (220) X2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-158

FIGURE 2-326.

INSPECT HEX SOCKET COUNTERSUNK HEAD SCREW, SMALL (219) X2, BARREL EXTENSION SCREW (231) X4, SPRING, SCREW (222) X4, SUPPORT, SCREW (221) X4, AND NUT, SUPPORT, SCREW (220) X2 FOR DISCREPANCIES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-159

FIGURE 2-327.

INSPECT RECEIVER ASSEMBLY (210H) FOR DISCREPANCIES. . . . . . . . . . . . . 2-159

FIGURE 2-328.

INSTALL NUT, SUPPORT, SCREW (220) INTO RECEIVER ASSEMBLY (210H). . 2-160

FIGURE 2-329.

INSTALL BARREL EXTENSION SCREW (231) X2 AND SPRING, SCREW (222) INTO SUPPORT, SCREW (221). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-160

FIGURE 2-330.

INSTALL HEX SOCKET COUNTERSUNK HEAD SCREW, SMALL (219) INTO SUPPORT, SCREW (221), AND HAND-TIGHTEN INTO RECEIVER ASSEMBLY (210H). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-161

FIGURE 2-331.

TORQUE HEX SOCKET COUNTERSUNK HEAD SCREW, SMALL (219) INTO RECEIVER ASSEMBLY (210H). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-161

FIGURE 2-332.

USE HEAT GUN (UT2832) TO LOOSEN RECEIVER SCREW (216) X2. . . . . . . . . . 2-162

FIGURE 2-333.

USE TORQUE SCREWDRIVER (UT1937) TO UNSCREW AND REMOVE RECEIVER SCREW (216) X2. REMOVE DEFLECTOR/BUTTSTOCK LOCK (230H) FROM RECEIVER ASSEMBLY (210H). . . . . . . . . . . . . . . . . . . . . . . . 2-162

FIGURE 2-334.

REMOVE DEFLECTOR/BUTTSTOCK LOCK SUPPORT (233) FROM DEFLECTOR/ BUTTSTOCK LOCK (230H). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-163 xxiii

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PAGE

FIGURE 2-335.

INSPECT RECEIVER SCREW (216) X2, DEFLECTOR/BUTTSTOCK LOCK SUPPORT (233), AND DEFLECTOR/BUTTSTOCK LOCK (230H) FOR DISCREPANCIES.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-164

FIGURE 2-336.


FIGURE 2-337.

INSERT DEFLECTOR/BUTTSTOCK LOCK SUPPORT (233) INTO DEFLECTOR/ BUTTSTOCK LOCK (230H). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-165

FIGURE 2-338.

INSERT DEFLECTOR/BUTTSTOCK LOCK (230H) INTO RECEIVER ASSEMBLY (210H), AND HAND-TIGHTEN RECEIVER SCREW (216) X2. . . . . . . 2-165

FIGURE 2-339.

USE TORQUE SCREWDRIVER (UT1937) TO TIGHTEN RECEIVER SCREW (216) X2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-166

FIGURE 2-340.

USE HEAT GUN (UT2832) TO LOOSEN BACKPLATE TOP SCREW (243). . . . . . 2-167

FIGURE 2-341.

USE TORQUE SCREWDRIVER (UT1937) TO UNSCREW AND REMOVE BACKPLATE TOP SCREW (243) FROM RECEIVER ASSEMBLY (210H). . . . . . . . 2-167

FIGURE 2-342.

USE HEAT GUN (UT2832) TO LOOSEN RECEIVER SCREW (216) X4. . . . . . . . . 2-168

FIGURE 2-343.

WITH TORQUE SET AT 2.5 NM (22.1 IN/LBS) UNSCREW RECEIVER SCREW (216) X4 CCW AND REMOVE FROM RECEIVER ASSEMBLY (210H). REMOVE PLATE, BACK (215) FROM BACK OF RECEIVER ASSEMBLY.. . . . . . . 2-168

FIGURE 2-344.

INSPECT BACKPLATE TOP SCREW (243), RECEIVER SCREW (216) X4, AND PLATE, BACK (215) FOR DISCREPANCIES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-169

FIGURE 2-345.


FIGURE 2-346.

INSERT PLATE, BACK (215) INTO RECEIVER ASSEMBLY (210H). . . . . . . . . . . . 2-170

FIGURE 2-347.

INSERT BACKPLATE TOP SCREW (243), AND USE ADAPTER, 3 MM (UT2380) TO HAND-TIGHTEN.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-170

FIGURE 2-348.

USE TORQUE SCREWDRIVER (UT1937) TO COMPLETELY TIGHTEN BACKPLATE TOP SCREW (243).. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-171

FIGURE 2-349.

USE ADAPTER, 2.5 MM (UT2378) TO HAND-TIGHTEN RECEIVER SCREW (216) X4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-171

FIGURE 2-350.

USE TORQUE SCREWDRIVER (UT1937) TO COMPLETELY TIGHTEN RECEIVER SCREW (216) X4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-172

FIGURE 2-351.

REAR SIGHT ASSEMBLY. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-173

FIGURE 2-352.

LOOSEN LOCKING PLATE SCREW (789). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-173

FIGURE 2-353.

REMOVE REAR SIGHT ASSEMBLY (760) FROM RECEIVER ASSEMBLY (210H).. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-173

FIGURE 2-354.

REMOVE O-RING (437) FROM LOCKING PLATE SCREW (789). . . . . . . . . . . . . . 2-174

FIGURE 2-355.

REMOVE LOCKING PLATE (763). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-174

FIGURE 2-356.

INSPECT REAR SIGHT ASSEMBLY (760), LOCKING PLATE SCREW (789), LOCKING PLATE (763), AND O-RING (437) FOR DISCREPANCIES. . . . . . . . . . . 2-175

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PAGE

FIGURE 2-357.

INSERT LOCKING PLATE SCREW (789) INTO FLAT SURFACED HOLE OF LOCKING PLATE (763).. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-176

FIGURE 2-358.

FIT O-RING (437) ONTO THREADED END OF LOCKING PLATE SCREW (789). . 2-176

FIGURE 2-359.

INSTALL REAR SIGHT ASSEMBLY (760) ONTO REAR MOST MIL-STD-1913 SLOT OF RECEIVER ASSEMBLY (210H). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-176

FIGURE 2-360.

TIGHTEN (CW) LOCKING PLATE SCREW (789) UNTIL PROPER TORQUE IS REACHED. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-176

FIGURE 2-361.

PUSH DOWN ON SPRING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-177

FIGURE 2-362.

EASE OFF FLOORPLATE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-178

FIGURE 2-363.

REMOVE SPRING AND FOLLOWER.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-178

FIGURE 2-364.

INSPECT MAGAZINE SPRING AND FOLLOWER FOR DISCREPANCIES. . . . . . . 2-179

FIGURE 2-365.

INSPECT MAGAZINE FLOORPLATE FOR DISCREPANCIES. . . . . . . . . . . . . . . . . 2-179

FIGURE 2-366.

INSPECT MAGAZINE BODY FOR DISCREPANCIES.. . . . . . . . . . . . . . . . . . . . . . . 2-179

FIGURE 2-367.

START FOLLOWER AND SPRING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-180

FIGURE 2-368.

INSERT SPRING.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-180

FIGURE 2-369.

PUSH IN FLOORPLATE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-181

FIGURE 2-370.

FULLY SEAT FLOORPLATE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-181

FIGURE 2-371.

GAS BLOCK REASSEMBLY.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-182

FIGURE 2-372.

RE-INSTALL BOLT ASSEMBLY AND BOLT CAM PIN. . . . . . . . . . . . . . . . . . . . . . . 2-182

FIGURE 2-373.

RE-INSTALL FIRING PIN. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-183

FIGURE 2-374.

RE-INSTALL FIRING PIN RETAINING PIN. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-183

FIGURE 2-375.

RE-INSTALL RETURN SPRING ASSEMBLY.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-183

FIGURE 2-376.

INSERT MOVING PARTS ASSEMBLY.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-184

FIGURE 2-377.

RE-INSTALL CHARGING HANDLE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-184

FIGURE 2-378.

RE-INSTALL MOVING PARTS ASSEMBLY.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-184

FIGURE 2-379.

RE-INSTALL BUTTSTOCK MODULE.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-185

FIGURE 2-380.

TAKEDOWN PIN, TRIGGER MODULE POSITION FOR RE-INSTALLATION.. . . . . 2-185

FIGURE 2-381.

HAMMER COCKED. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-185

FIGURE 2-382.

RE-INSTALL TRIGGER MODULE, COMPLETE. . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-186

FIGURE 2-383.

REASSEMBLE MAGAZINE.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-186

FIGURE 2-384.

UNLOAD AND CLEAR. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-187

FIGURE 3-1.

NO GO HEADSPACE GAUGE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2

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PAGE

FIGURE 3-2.

BOLT NOT LOCKING WITH NO GO HEADSPACE GAUGE INSERTED INTO CHAMBER. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2

FIGURE 3-3.

GO HEADSPACE GAUGE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3

FIGURE 3-4.

BOLT LOCKING WITH GO HEADSPACE GAUGE INSERTED INTO CHAMBER. . . . 3-3

FIGURE 3-5.

ATTACH TRIGGER PULL SCALE TO TRIGGER. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4

FIGURE 3-6.

SLOWLY PULL SCALE TO REAR UNTIL HAMMER FALLS; READ SCALE. . . . . . . . 3-4

FIGURE 3-7.

MK 17 MOD 0 BARREL STRAIGHTNESS GAUGE.. . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5

FIGURE 3-8.

INSERT MK 17 MOD 0 BARREL STRAIGHTNESS GAUGE INTO CHAMBER. . . . . . 3-6

FIGURE 3-9.

LET MK 17 MOD 0 BARREL STRAIGHTNESS GAUGE FALL FREELY THROUGH BARREL AND REMOVE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6

FIGURE 3-10.

INSERT MK 17 MOD 0 BARREL STRAIGHTNESS GAUGE INTO CHAMBER. . . . . . 3-7

FIGURE 3-11.

LET MK 17 MOD 0 BARREL STRAIGHTNESS GAUGE FALL FREELY THROUGH BARREL/SUPPRESSOR AND REMOVE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7

FIGURE 4-1.

BORESCOPE KIT.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2

FIGURE 4-2.

BORESCOPE KIT.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2

FIGURE 4-3.

STRAIGHT-AHEAD VIEWING TUBE.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3

FIGURE 4-4.

SIDE VIEWING TUBE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3

FIGURE 4-5.

COUPLER AND CAMERA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3

FIGURE 4-6.

EYECUP AND COUPLER BEZEL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4

FIGURE 4-7.

CAMERA LEAD. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4

FIGURE 4-8.

VIDEO MONITOR.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4

FIGURE 4-9.

NEW BARRELS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5

FIGURE 4-10.

MODERATE USE.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6

FIGURE 4-11.

BARREL EROSION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6

FIGURE 4-12.

UNSERVICEABLE BARREL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7

FIGURE B-1.

MK 17 MOD 0 MAJOR COMPONENTS.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-5

FIGURE B-2.

MK 17 MOD 0 (S/CQC/LB).. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-7

FIGURE B-3.

MAGAZINE ASSEMBLY (MK 17 MOD 0 (S/CQC/LB)). . . . . . . . . . . . . . . . . . . . . . . . . B-8

FIGURE B-4.

MOVING PARTS ASSEMBLY. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-9

FIGURE B-5.

BUTTSTOCK MODULE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-11

FIGURE B-6.

TRIGGER MODULE.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-13

FIGURE B-7.

COMPLETE BARREL ASSEMBLIES (S, CQC AND LB). . . . . . . . . . . . . . . . . . . . . . . B-15

FIGURE B-8.

RECEIVER ASSEMBLY (S, CQC, AND LB). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-17

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PAGE

FIGURE B-9.

REAR SIGHT ASSEMBLY. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B-19

FIGURE B-10.

ANCILLARY EQUIPMENT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-20

FIGURE B-11.

TOOLS AND GAUGES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-31

FIGURE B-12.

T-HANDLE TORQUE WRENCH AND T-25 ADAPTER BIT. . . . . . . . . . . . . . . . . . . . .B-33

FIGURE B-13.

TORQUE ANALYZER. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-34

FIGURE B-14.

1/4” X 1/4” DRIVE-FEMALE TO FEMALE ADAPTER.. . . . . . . . . . . . . . . . . . . . . . . . . B-34

FIGURE E-1.

RIFLE, 5.56 MM, MK 16 MOD 0. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-1

FIGURE E-2.

RIFLE, 7.62 MM, MK 17 MOD 0. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-1

FIGURE E-3.

DAMAGED SOUND SUPPRESSOR.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .E-4

FIGURE E-4.

BULGED SOUND SUPPRESSOR. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-4

FIGURE E-5.


FIGURE E-6.


xxvii/xxviii blank


SW370-CF-TRS-010

LIST OF TABLES TABLE

PAGE

TABLE B-1.

MK 17 MOD 0 5 MAJOR COMPONENTS.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B-6

TABLE B-2.

MK 17 MOD 0 (S/CQC/LB). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B-7

TABLE B-3.

MAGAZINE ASSEMBLY (MK 17 MOD 0 (S/CQC/LB)). . . . . . . . . . . . . . . . . . . . . . . . . . B-8

TABLE B-4.

MOVING PARTS ASSEMBLY.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-10

TABLE B-5.

BUTTSTOCK MODULE.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-12

TABLE B-6.

TRIGGER MODULE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B-14

TABLE B-7.

COMPLETE BARREL ASSEMBLIES (S, CQC AND LB). . . . . . . . . . . . . . . . . . . . . . . B-16

TABLE B-8.

COMPLETE RECEIVER ASSEMBLY (S, CQC, AND LB). . . . . . . . . . . . . . . . . . . . . . B-18

TABLE B-9.

REAR SIGHT ASSEMBLY. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B-19

TABLE B-10.

ANCILLARY EQUIPMENT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B-21

TABLE B-11.

TOOLS AND GAUGES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B-32

TABLE D-1.

PARTS COMMONALITY (MK 17 MOD 0 & MK 16 MOD 0). . . . . . . . . . . . . . . . . . . . . .D-1

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SW370-CF-TRS-010

CHAPTER 1 INTRODUCTION CHAPTER OVERVIEW This chapter contains general information, equipment description and data, and operating principles on MK 17 MOD 0 7.62 mm. Section I. GENERAL INFORMATION 1-1.

SCOPE. a. Type of Manual: Technical Repair Standard (TRS) b. Model Number and Equipment Name: MK 17 MOD 0 7.62 mm

1-2.

DESTRUCTION OF NAVY MATERIAL TO PREVENT ENEMY USE.

Procedure for Destruction of Equipment to Prevent Enemy Use wil l be found in Technical Manual (TM) 750-224-7. 1-3.

DEMILITARIZATION OF SMALL ARMS RESIDUE.

To prevent unauthorized use of weapon’s replaced (used) components, subassemblies and associated small arms equipment following repair, demilitarization will be accomplished in accordance with (IAW) Department of Defense (DoD) 4160.21-M-1, Defense Demilitarization Manual. 1-4.

REPORTING EQUIPMENT IMPROVEMENT RECOMMENDATIONS (EIR).

If MK 17 MOD 0 needs improvement, inform Program Office. User and maintainer are the only ones who can tell us what improvements to weapon are needed. Let us know what is lacking in design or performance. Tell us why a procedure is hard to perform and/or recommend improved procedure. A reply will be furnished directly to you. Fill out the Technical Manual Deficiency/Evaluation R eport (TMDER) found in Appendix I. Report to: Commander Crane Division Naval Surface Warfare Center

1-1

SW370-CF-TRS-010

Section II. EQUIPMENT DESCRIPTION AND DATA 1-5.

MAJOR COMPONENTS LOCATION AND DESCRIPTION.

Figure 1-1. Major Components.

1-2

SW370-CF-TRS-010

1-5.

MAJOR COMPONENTS LOCATION AND DESCRIPTION. (CONT.)

Magazine Assembly (1)

Steel construction. Holds 10 or 20 cartridges for feeding and provides guide to position cartridges for stripping. Provides for quick reload capabilities for sustained firing.

Trigger Module, Complete (2)

Contains trigger assembly, sear, hammer assembly, ambidextrous selector lever, rifle grip, bolt catch/release, and ambidextrous magazine release.

Buttstock Module (3)

Buttstock provides adjustable 1/2” of height for cheek weld, 6position Length of Pull (LOP), and is side folding for compact carry. It also contains ambidextrous rear sling attachment point.

Moving Parts Assembly (4)

Consists of bolt/bolt carrier, return spring assembly, and charging handle.

Complete Receiver Assembly (5)

Contains receiver assembly (serialized item), barrel assembly (Close Quarter Combat (CQC), Standard (S), or Long Barrel (LB)), rear sight assembly, front sight assembly, brass deflector/buttstock lock, barrel retention system, MIL-STD-1913 Rails at 3, 6, 9, and 12 o’clock position, gas block, gas regulator, and gas piston. Additional ambidextrous sling mounts and ambidextrous charging handle options.

1-6.

NOMENCLATURE.

Figure 1-2. Nomenclature Left Side.

1. Flash Hider 2. Barrel 3. Front Sight Assembly 4. Front Sight Locking Pin 5. Sling Attachment Point 6. 9 O’clock Rail 7. Charging Handle Slot 8. Bolt/Catch Release 9. Rear Sight Assembly 10. Cheek Rest Adjusting Button

11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 1-3

Cheek Rest Buttplate Gas Block Barrel Extension Screw x3 Trigger Module Takedown Pin Magazine Catch/Release Selector Lever Sling Attachment Points Buttstock Lock LOP Lock

SW370-CF-TRS-010

1-6.

NOMENCLATURE. (CONT.)

Figure 1-3. Nomenclature Right Side.

21. 22. 23. 24. 25. 26. 27. 28. 29.

Sling Attachment Point Adjustable Foldable Buttstock Buttstock Hinge 12 O’clock Rail Charging Handle 3 O’clock Rail 6 O’clock Rail Sling Attachment Point Gas Regulator

30. 31. 32. 33. 34. 35. 36. 37. 38.

1-4

Sling Attachment Point Selector Lever Pistol Grip Trigger Magazine Catch/Release Deflector/Buttstock Lock Magazine Ejection Port Barrel Extension Screw x3

SW370-CF-TRS-010

1-7.

TECHNICAL DATA.

1-5

SW370-CF-TRS-010

1-8.

OPERATING PRINCIPLES. a. Selector lever. MK 17 MOD 0 operation depends on Selector Lever (567) setting. Selector lever can be set at one of the following three positions: (1) ‘S’ (SAFE). ‘S’ position should be set when cocked rifle is not operational or when it should be loaded or transported without any risk. In this position, Trigger (545) rear lug is in contact with Selector Cam (566) solid portion. Trigger is then locked and firing is impossible (Figure 1-4).

Figure 1-4. Safe.

1-6

SW370-CF-TRS-010

1-8.

OPERATING PRINCIPLES. (CONT.) a. Selector lever. (cont.) (2) ‘1’ SEMI-AUTOMATIC. When Selector Lever (567) is set at position ‘1’, Trigger (545) can be pulled to fire rifle if ammunition has been loaded into chamber. In this position, Trigger (545) rear lug is al igned with undercut of Selector Cam (566) allowing trigger to move each time operator pulls it (Figure 1-5). As a result, rifle will fire one shot when Trigger (545) is pulled.

Figure 1-5. Semi-Automatic.

1-7

SW370-CF-TRS-010

1-8.

OPERATING PRINCIPLES. (CONT.) a. Selector lever. (cont.) (3) ‘A’ AUTOMATIC. When Selector Lever (567) is set at position ‘A’, Trigger (545) can be pulled to fire rifle if ammunition has been loaded into chamber. In this position, rear lug of Trigger (545) is aligned with undercut of Selector Cam (566) allowing trigger to move each time operator pulls it ( Figure 1-6). In this position, rifle will fire a burst when Trigger (545) is pulled. Burst is stopped when trigger is released or source of ammunition is depleted.

Figure 1-6. Automatic.

1-8

SW370-CF-TRS-010

1-8.

OPERATING PRINCIPLES. (CONT.) b. Action of gases. (1) Cartridge is chambered. (2) Rifle is locked. Percussion and firing take place (Figure 1-7).

Figure 1-7. Percussion and Firing.

(3) Effect of gases propels bullet forward inside barrel. When bullet has passed beyond vent hole, part of gases is transmitted to piston head via gas block ( Figure 1-8).

Figure 1-8. Bullet Propels Forward.

1-9

SW370-CF-TRS-010

1-8.

OPERATING PRINCIPLES. (CONT.) b. Action of gases. (cont.) (4) Pressure of gases pushes Gas Piston Assembly (120) to rear (Figure 1-9).

Figure 1-9. Gas Piston Assembly Towards Rear.

c. Gas adjustment: ‘UNSUPPRESSED’ and ‘SUPPRESSED’ conditions. (1) Normal cyclic rate of fire is obtained by Screw, Gas Control (125). The larger inner diameter of screw, gas control, the higher cyclic rate of fire. The narrower inner diameter of screw, gas control, the lower cyclic rate of fire. (2) Rifle is used in the following way: Rotate Gas Regulator (129) to left viewing from front (10 o’clock position) for firing i n ‘SUPPRESSED’ condition and to right viewing from front (12 o’clock position) for firing in ‘UNSUPPRESSED’ condition (Figure 1-10).

Figure 1-10. Unsuppressed and Suppressed Conditions.

d. Cycle of operation. Fully understanding MK 17 MOD 0’s cycle of operation will greatly reduce downtime should weapon not function properly. Knowing cycle of operation enables operator to clearly describe what i s happening with weapon to armorer for faster maintenance. (1) UNLOCKING occurs when bolt carrier recoils and inclined face of its unlocking ramp makes contact with bolt cam pin and forces bolt assembly to rotate. Bolt cam pin starts to cam in slot on left side of bolt carrier turning locking lugs until they are clear to move to rear, free of barrel extension. (2) EXTRACTING occurs after unlocking when bolt carrier pulls bolt to rear and extractor pulls cartridge case from chamber at high speed. During this cycle, cartridge case is held to bolt assembly by extractor. (3) EJECTING occurs during rearward movement of moving parts assembly to which cartridge case is still held. When front of case clears front edge of ejection port, ejector pushes on left side of case head. This action and continued movement of bolt carrier to rear cause cartridge case to strike brass deflector and then clear weapon system. (4) COCKING happens when bolt carrier moves to rear far enough to contact hammer and to push it down and to rear until fully compressed. As bolt moves all the way to rear, return spring is fully compressed, which now forces bolt carrier back to front. Cocking starts while ejection is occurring.

1-10

SW370-CF-TRS-010

1-8.

OPERATING PRINCIPLES. (CONT.) d. Cycle of operation. (cont.) (5) FEEDING begins as bolt carrier returns forward and front of bolt contacts next round in magazine. Once round is pushed far enough forward, rim of case will clear magazine feed lips and move toward chamber. (6) CHAMBERING starts as tip of projectile clears barrel extension and enters rear of chamber. (7) LOCKING occurs as continued momentum of bolt carrier moving forward causes extractor to move over case rim and bolt cam pin cams in slot in bolt carrier forcing locking lugs to rotate in barrel extension. (8) FIRING begins with active thought of pulling trigger to engage target. With weapon in semiautomatic or full automatic mode (hammer cocked; Figure 1-11), pulling trigger will cause sear to disengage hammer notch allowing hammer to fall ( Figure 1-12). Hammer will strike firing pin, which in turn strikes primer discharging powder. As bulle t passes gas port in barrel, expanding gases go up through gas port into gas regulator. Gases impart energy onto short stroke gas piston pushing it to rear. Gas piston contacts front of bolt carrier starting its movement to rear. Movement of bolt carrier starts next phase. Any excess gas is vented forward through vent hole located in gas regulator.

Figure 1-11. Hammer Cocked.

Figure 1-12. Hammer Fallen.

(9) In semi-automatic fire mode (‘1’), Automatic Sear (581) locks hammer ( Figure 1-12). As bolt carrier completes it forward movement, it contacts automatic sear and releases hammer. As trigger is held to rear, Hammer (555) is immediately engaged by Sear (547) and remains in cocked position (Figure 1-13). When Trigger (545) is released, sear releases rear tooth of hammer and immediately engages front tooth of trigger ( Figure 1-14). Pulling trigger again releases hammer from front tooth of trigger and allows hammer to strike firing pin (431H) ( Figure 1-15).

1-11

SW370-CF-TRS-010

1-8.

OPERATING PRINCIPLES. (CONT.) d. Cycle of operation. (cont.)

Figure 1-14. Engages Front Tooth of Trigger.

Figure 1-13. Cocked Position.

Figure 1-15. Hammer Released to Strike Firing Pin.

(10) In automatic fire mode (‘A’), Automatic Sear (581) locks Hammer (555). As bolt carrier completes its forward movement, it contacts automatic sear and releases hammer. Selector Lever (567) prevents Sear (547) from holding hammer, thus striking firing pin. Firing takes place, and automatic fire continues until trigger is released or ammunition is depleted ( Figure 1-16). Releasing trigger will engage trigger front tooth with hammer and hammer is then cocked (automatic fire stops). During automatic fire, hammer is controlled by automatic sear.

Figure 1-16. Trigger Released.

1-12

SW370-CF-TRS-010

1-8.

OPERATING PRINCIPLES. (CONT.) d. Cycle of operation. (cont.) Cycle of operation is continuous until either stopped by operator, magazine is empty, or rifle incurs stoppage or malfunction at which time operator should begin troubleshooting procedures.

1-9.

CORROSION, PREVENTION, AND CONTROLS (CPC).

CPC of material is a continuing concern. It is important that any corrosion problems wi th this item be reported so that the problem can be corrected and improvements can be made to prevent the problem in the future. While corrosion is typically associated with rusting metals, it can also include deterioration of other materials such as rubber or plastic. Unusual cracking, softening, swelling, or breaking of these materials may be a corrosion problem. If a corrosion problem is identified, it can be reported using SF 368 Product Quality Deficiency Report (PQDR). Use of key words such as corrosion, rust, deterioration, or cracking will assure that information is identified as a CPC problem. The form should be submitted to: Commander Crane Division Naval Surfa Attn: Code 300 H Crane, IN 47522-5001 or e-mail to: [email protected]

1-13/1-14 blank


SW370-CF-TRS-010

CHAPTER 2 MAINTENANCE INSTRUCTIONS CHAPTER OVERVIEW This chapter contains information regarding repair parts, special tools, common tools and equipment, instructions for service upon receipt, Preventive Maintenance Checks and Services (PMCS), troubleshooting, maintenance to keep weapon in good repair, and storage. Section I. REPAIR PARTS, SPECIAL TOOLS, AND COMMON TOOLS AND EQUIPMENT 2-1.

REPAIR PARTS.

Repair parts are listed and illustrated in Appendix B. 2-2.

SPECIAL TOOLS.

Special tools authorized for maintenance are listed and illustrated in Appendix B. 2-3.

EXPENDABLE/DURABLE SUPPLIES AND MATERIALS LIST.

Expendable/durable supplies and materials are listed and illustrated in Appendix C. Section II. SERVICE UPON RECEIPT 2-4.

GENERAL.

When MK 17 MOD 0 is received, it is user organization’s responsibility to determine whether weapon has been properly prepared for service by supplying organization and whether it is in condition to perform its mission. 2-5.

SERVICE UPON RECEIPT OF MATERIAL. WARNING

Before starting inspection, do not actuate trigger until weapon has been cleared. Inspect chamber to be sure that it is empty. Check for obstructions in barrel bore. NOTE Weapon must be inspected and/or gauged at least annually for safety and serviceability IAW PMCS.

2-1

SW370-CF-TRS-010

2-5.

SERVICE UPON RECEIPT OF MATERIAL. (CONT.) Item No.

Item to be Inspected MK 17 MOD 0

1.

Container

2.

MK 17 MOD 0

Complete Receiver Assembly and Trigger Module, Complete

Procedure

Remarks

Check unpacked equipment. a. Inspect equipment for damage incurred during shipment. If equipment is damaged, report damage on Standard Form 368, PQDR. b. Check equipment against packing slip to ensure shipment is complete. Report all discrepancies on SF 368 PQDR. c. Ensure equipment has not been modified. Remove corrosion inhibitor from barrel and discard. a. Fieldstrip MK 17, and inspect for missing parts. b. Clean and lubricate.

c. d.

Reassemble. Perform function test using loose dummy ammunition.

Refer to page 2-20. Refer to Operator’s Manual, SW370-A4OPI-010. Refer to page 2-26. Refer to page 2-187.

Section III. PREVENTIVE MAITNENANCE CHECKS AND SERVICES (PMCS) 2-6.

PREVENTIVE MAITNENANCE CHECKS. a. These services are to be performed by trained and authorized personnel. Operators will clean and lubricate IAW SW370-A4-OPI-010. b. Perform PMCS as required to keep weapon combat ready. c. If weapon has not been used for 90 days, PMCS IAW SW370-A4-OPI-010 should also be performed.

2-2

SW370-CF-TRS-010

2-6.

PREVENTIVE MAITNENANCE CHECKS. (CONT.)

Item No. Item to be Inspected 1. MK 17 MOD 0 2.

Complete Receiver Assembly

Procedure Fieldstrip weapon (see page 2-20). Check for compliance with annual gauging requirements. Visually inspect Complete Receiver Assembly (201H-S), Barrel (110H-S), and MIL-STD-1913 Rails for bulges, cracks, bends, burrs, obstructions, or pits in chamber/bore. Inspect all screws for looseness. Inspect Flash Hider (138H) for bulges, cracks, and burrs. Inspect sling attachment points for bulges and cracks. Inspect Gas Regulator (129) for cracks and proper movement. Inspect Front Sight Post (188) for deformities. Inspect Front Sight Assembly (140) for cracks and proper movement. Check Deflector/Buttstock Lock (230H) for cracks, burrs, and deformities. Inspect Rear Sight Assembly (760) for cracks and deformities, and ensure proper movement.

2-3

SW370-CF-TRS-010

2-6.


2-4

SW370-CF-TRS-010

2-6.


Item No. Item to be Inspected 3. Moving Parts Assembly

Procedure Inspect Bolt Carrier (411H) for burrs, cracks, bends, and bulges. Check Bolt Cam Pin (430) for burrs and cracks. Check Firing Pin (431H) for straightness, burrs, and breaks. Ensure tip is completely round. Check Firing Pin Retaining Pin Assembly (435) for burrs, cracks, and deformities. Check Bolt Assembly (420H) for cracks and burrs. Check bolt face for pitting. Ensure firing pin hole is round and not elongated. Inspect bolt lugs for breaks, cracks, and burrs. Inspect Extractor (424H) for cracks and weak Extractor Spring (422). Check Ejector (426) for breaks or cracks. Check for weak Ejector Spring (427). Check Charging Handle (450) for bulges, cracks, burrs, and deformities. Inspect Return Spring Assembly (440H) for cracks, burrs, and deformities. Check Return Spring (443H) for weakness.

2-5

SW370-CF-TRS-010

2-6.


2-6

SW370-CF-TRS-010

2-6.


2-7

SW370-CF-TRS-010

2-6.


2-8

SW370-CF-TRS-010

2-6.


Item No. Item to be Inspected 6. Magazine Assembly

Procedure Inspect Magazine, 20-round (601H-20) body for burrs, cracks, bends, and bulges. Check floorplate for bends, breaks, cracks, and burrs. Inspect spring for weakness and cracks and follower for cracks.

Figure 2-5. Magazine Assembly.

NOTE Chipped or broken extractor, weak extractor spring, or impeded extractor can cause weapon stoppage, commonly referred to as failure to extract. Broken ejector or weak ejector spring can cause weapon stoppage, commonly referred to as failure to eject.

2-9

SW370-CF-TRS-010

Section IV. TROUBLESHOOTING 2-7.

MAINTENANCE TROUBLESHOOTING. a. This section contains troubleshooting information for locating and correcting most operating troubles that may develop in MK 17 MOD 0. Each malfunction for part, assembly, or subassembly is followed by list of tests or inspections, which will help determine corrective actions to take. Perform tests or inspections and corrective actions in order listed. b. This manual cannot list all possible malfunctions that may occur, nor all tests or inspections and corrective actions. If malfunction is not listed, contact NSWC C rane via [email protected] for further guidance. c. Knowing and understanding MK 17 MOD 0’s cycle of operation will help tremendously in identifying specific problems. Cycle can start or stop at any point in its continuum (Firing, Unlocking, Extracting, Ejecting, Cocking, Feeding, Chambering, and Locking). Malfunction Index Magazine fails to lock into rifle Failure to fire Failure to unlock Failure to extract Failure to eject Failure to cock Failure to feed Failure to chamber Failure to lock Short recoil Moving parts assembly fails to lock to rear after last round Fires with selector on SAFE

2-10

Procedure Page 2-11 2-12 2-13 2-14 2-14 2-16 2-16 2-16 2-16 2-17 2-17 2-18

SW370-CF-TRS-010

2-8.

TROUBLESHOOTING PROCEDURES. a. MAGAZINE FAILS TO LOCK INTO RIFLE. STEP 1. Magazine fails to lock into rifle. (a) CORRECTIVE ACTION Inspect magazine for deformities in area of locking notch.

Figure 2-6. Magazine Locking Notch.

STEP 2. Dirty or corroded Magazine Catch/Release (531H) or Magazine C atch/Release Lever, Right (537). (a) CORRECTIVE ACTION Disassemble and clean (page 2-64). STEP 3. Defective Magazine Catch/Release Spring (539). (a) CORRECTIVE ACTION Replace magazine catch/release spring (page 2-64). STEP 4. Worn or broken Magazine Catch/Release (531H). (a) CORRECTIVE ACTION Replace magazine catch/release or magazine catch/release lever, right (see page 2-64).

Figure 2-7. Magazine Catch Release.

2-11

SW370-CF-TRS-010

2-8.

TROUBLESHOOTING PROCEDURES. (CONT.) b. FAILURE TO FIRE. STEP 1. Selector lever on ‘S’. (a) CORRECTIVE ACTION Move selector lever to ‘1’ (semi-automatic) or ‘A’ (automatic). If unable to move, remove and replace (see page 2-51).

Figure 2-8. Selector Lever on ‘S’.

STEP 2. Check Firing Pin (431H) for flattened tip and/or damage. (a) CORRECTIVE ACTION If damaged, remove and replace.

Figure 2-9. Firing Pin.

STEP 3. Broken Hammer (555). (a) CORRECTIVE ACTION Complete Malfunction Report, and email to [email protected].

Figure 2-10. Hammer.

2-12

SW370-CF-TRS-010

2-8.

TROUBLESHOOTING PROCEDURES. (CONT.) b. FAILURE TO FIRE. (CONT.) STEP 4. Weak or broken Hammer Spring (558). (a) CORRECTIVE ACTION Complete Malfunction Report, and email to [email protected]. STEP 5. Hammer (555) not cocking (see page 2-16, Failure to Cock for further info). (a) CORRECTIVE ACTION Complete Malfunction Report, and email to [email protected]. STEP 6. Trigger fails to release Hammer (555). (a) CORRECTIVE ACTION Complete Malfunction Report, and email to [email protected].

Figure 2-11. Hammer Spring.

c. FAILURE TO UNLOCK. STEP 1. Burred locking lugs on Bolt Assembly (420H). (a) CORRECTIVE ACTION Complete Malfunction Report, and email to [email protected].

Figure 2-12. Locking Lugs.

(b) CORRECTIVE ACTION See Short Recoil Inspection, page 2-17.

2-13

SW370-CF-TRS-010

2-8.

TROUBLESHOOTING PROCEDURES. (CONT.) d. FAILURE TO EXTRACT. STEP 1. Dirty or damaged chamber. (a) CORRECTIVE ACTION Clean chamber. STEP 2. Inspect Extractor (424H), Extractor Spring (422), Extractor Plunger (423), and Extractor Pin (425). (a) CORRECTIVE ACTION Clean and lubricate extractor. (b) CORRECTIVE ACTION Replace extractor if broken or lip is chipped/worn. (c) CORRECTIVE ACTION Replace extractor spring if broken or weak. (d) CORRECTIVE ACTION Replace extractor plunger if damaged. (e) CORRECTIVE ACTION Replace extractor pin if damaged.

Figure 2-13. Inspect Extractor.

e. FAILURE TO EJECT. STEP 1. Failure to eject. (a) CORRECTIVE ACTION Inspect Ejector (426) and Ejector Spring (427) (ensure ejector can be depressed so it is flush with bolt face and springs back to full protrusion).

Figure 2-14. Ejector and Ejector Spring.

2-14

SW370-CF-TRS-010

2-8.

TROUBLESHOOTING PROCEDURES. (CONT.) e. FAILURE TO EJECT. (CONT.) STEP 2. Dirty Bolt Carrier (411H). (a) CORRECTIVE ACTION Clean and lubricate if needed.

Figure 2-15. Bolt Carrier.

STEP 3. Dirty Return Spring Assembly (440H). (a) CORRECTIVE ACTION Clean and lubricate if needed.

Figure 2-16. Return Spring Assembly.

2-15

SW370-CF-TRS-010

2-8.

TROUBLESHOOTING PROCEDURES. (CONT.) f. FAILURE TO COCK. STEP 1. Worn or broken Trigger (545) or Trigger Return S pring (521). (a) CORRECTIVE ACTION Complete Malfunction Report, and email to [email protected].

Figure 2-17. Trigger or Trigger Return Spring.

g. FAILURE TO FEED. STEP 1. Damaged Magazine (601H). (a) CORRECTIVE ACTION Replace magazine assembly (see page 2-66). STEP 2. Dirty or damaged Return Spring Assembly (440H). (a) CORRECTIVE ACTION Clean and lubricate return spring assembly (see page 2-92). h. FAILURE TO CHAMBER. STEP 1. Chamber/bore is obstructed/dirty. (a) CORRECTIVE ACTION Remove obstruction and/or clean chamber. STEP 2. See Short Recoil Inspection (see page 2-17). i. FAILURE TO LOCK. STEP 1. Dirty or damaged bolt lugs (see page 2-98). (a) CORRECTIVE ACTION Clean bolt lugs (see page 2-98).

2-16

SW370-CF-TRS-010

2-8.

TROUBLESHOOTING PROCEDURES. (CONT.) j. SHORT RECOIL. STEP 1. Improper gap alignment or worn, missing, or broken Piston Rings (122) x3. (a) CORRECTIVE ACTION Replace piston ring set (3 rings) and clean (see page 2-122).

Figure 2-18. Piston Rings.

k. MOVING PARTS ASSEMBLY FAILS TO LOCK TO REAR AFTER LAST ROUND. STEP 1. Damaged Magazine Assembly (601H). (a) CORRECTIVE ACTION Replace magazine assembly. STEP 2. Broken Bolt Catch/Release (578H). (a) CORRECTIVE ACTION Replace bolt catch/release (see page 2-38). STEP 3. Spring-Type Straight Pin, Slotted (579) is not present or tight. (a) CORRECTIVE ACTION Replace if missing or loose (see page 2-38). STEP 4. Weak or broken Bolt Catch/Release Spring (577). (a) CORRECTIVE ACTION Replace bolt catch/release spring (see page 2-38).

2-17

SW370-CF-TRS-010

2-8.

TROUBLESHOOTING PROCEDURES. (CONT.) k. MOVING PARTS ASSEMBLY FAILS TO LOCK TO REAR AFTER LAST ROUND. (CONT.) STEP 5. Worn or broken Bolt Catch/Release Support (576). (a) CORRECTIVE ACTION Replace bolt catch/release support (see page 2-41).

Figure 2-19. Bolt Catch/Release Support.

l. FIRES WITH SELECTOR ON SAFE. STEP 1. Worn or broken Selector Lever (567). (a) CORRECTIVE ACTION Replace selector lever (see page 2-51). STEP 2. Broken Selector Lever, Short (571). (a) CORRECTIVE ACTION Replace selector lever, short (see page 2-51). STEP 3. Selector Lever Fixing Screw (568) x2 are not present or tight. (a) CORRECTIVE ACTION Replace if missing or loose (page 2-51). STEP 4. Weak or broken Selector Cam (566). (a) CORRECTIVE ACTION Replace selector cam (page 2-51).

Figure 2-20. Selector Cam.

2-18

SW370-CF-TRS-010

Section V. FIELDSTRIP PROCEDURES NOTE Figure may not represent weapon’s current configuration or specified parts. Figures will be updated as parts change and/or disassembly/reassembly procedures change. 2-9.

SAFETY CHECK. a. Carry out the following procedures in order to ensure that MK 17 MOD 0 can be manipulated, stored, and/or transported without any risk. CAUTION Be sure to clean weapon before initial use. Leaving initial protective lubricant in weapon can cause stoppage, malfunction, or failure due to over pressure. b. UNLOAD and CLEAR weapon before manipulation or disassembly as described in Figure 2-21. (1) Point weapon parallel to ground and in a safe direction. (2) Attempt to place weapon on ‘S’ (Step 1). (3) Remove magazine from weapon (Step 2). (4) Pull charging handle to rear, and lock moving parts assembly to rear utilizing bolt/catch release (Step 3). (5) Place weapon on ‘S’ if not already there (Step 4). (6) Visually and physically inspect chamber and magazine well, utilizing flashlight if necessary (Step 5). (7) Pull charging handle to rear most position. Then release letting moving parts assembly move forward under its own power. (8) Watch bolt assembly go forward on empty chamber.

Figure 2-21. Unload and clear.

2-19

SW370-CF-TRS-010

2-10. FIELDSTRIP PROCEDURES. a. Disassemble weapon into five major components. (1) Point weapon in a safe direction. (2) Remove trigger module, complete. (a) From LEFT side of weapon, push takedown pin, trigger module and pull out from RIGHT until trigger module is released from receiver assembly ( Figure 2-22).

Figure 2-22. Release Takedown Pin, Trigger Module.

(b) Push trigger module forward to release it from backplate, and then remove it by pulling downward (Figure 2-23).

Figure 2-23. Remove Trigger Module, Complete.

2-20

SW370-CF-TRS-010

2-10. FIELDSTRIP PROCEDURES. (CONT.) a. Disassemble weapon into five major components. (cont.) NOTE Do not try to remove takedown pin, trigger module on trigger module. Takedown pin, trigger module is retained in trigger module by retaining clip. (3) Remove buttstock module by pulling downward off of backplate; remove it entirely from backplate (Figure 2-24).

Figure 2-24. Remove Buttstock Module.

(4) Remove moving parts assembly. (a) Remove moving parts assembly by pulling charging handle fully rearward in charging handle slot while applying downward pressure on guide rod retaining plate exposing guide rod and return spring assembly (Figure 2-25).

Figure 2-25. Release Moving Parts Assembly.

(b) Charging handle is now able to be removed by pulling it out of moving parts assembly and freeing it from receiver assembly ( Figure 2-26).

Figure 2-26. Remove Charging Handle.

2-21

SW370-CF-TRS-010

2-10. FIELDSTRIP PROCEDURES. (CONT.) a. Disassemble weapon into five major components. (cont.) (c) Slide moving parts assembly to rear and out of receiver assembly (Figure 2-27).

Figure 2-27. Remove Moving Parts Assembly.

(d) Disassemble moving parts assembly. 1 Remove return spring assembly by pulling it out of bolt carrier (Figure 2-28).

Figure 2-28. Remove Return Spring Assembly.

NOTE It is not necessary to completely disassemble remainder of moving parts assembly for hasty application of lubricant. It is recommended that operator or armorer take into account environmental and operational conditions prior to disassembling entire moving parts assembly. 2

Using pointed end of charging handle, push firing pin retaining pin assembly from right side of bolt carrier. Remove it from left side of bolt carrier ( Figure 2-29).

Figure 2-29. Remove Firing Pin Retaining Pin.

2-22

SW370-CF-TRS-010

2-10. FIELDSTRIP PROCEDURES. (CONT.) a. Disassemble weapon into five major components. (cont.) 3 Remove firing pin by pulling it rearward (Figure 2-30).

Figure 2-30. Remove Firing Pin.

4

Remove bolt cam pin and bolt assembly from bolt carrier ( Figure 2-31).

Figure 2-31. Remove Bolt Cam Pin and Bolt Assembly.

2-23

SW370-CF-TRS-010

2-10. FIELDSTRIP PROCEDURES. (CONT.) b. Disassemble magazine assembly. WARNING

All spring-loaded assemblies are under spring tension; unintentional release will result in flying parts and possible injury. CAUTION Do not attempt to interchange other magazine parts (i.e., M4/M16 etc.) with MK 17 MOD 0 magazine parts. (1) Magazine, 7.62 mm (10- or 20-round). (a) Using rod eyelet or screwdriver, push down on spring releasing it from floorplate (Step 1). Ease floorplate towards rear of magazine (Step 2). Maintain spring tension with thumb, and remove floorplate from body. Continue to maintain spring tension (Step 3). Remove spring by working it slowly in a left-to-right motion until all tension is released and spring is removed freely from body (Step 4) (Figure 2-32).

Figure 2-32. Disassemble Magazine, 7.62 mm.

2-24

SW370-CF-TRS-010

2-10. FIELDSTRIP PROCEDURES. (CONT.) c. Weapon and magazine are now fieldstripped for maintenance. NOTE It is not necessary to disassemble moving parts assembly to conduct barrel change.

Figure 2-33. Complete Fieldstrip.

2-25

Pages 82 through 317 redacted for the following reasons: ---------------------------(b)(3), Subsections 5, 25, 30


SW370-CF-TRS-010

APPENDIX H STANDARD FORM 368 PRODUCT QUALITY DEFICIENCY REPORT (PQDF) The following is an example of SF368 Form. There is a form on the CD that can be completed and sent to [email protected].

H-1

SW370-CF-TRS-010

H-2

SW370-CF-TRS-010

APPENDIX I TECHNICAL MANUAL DEFICIENCY/EVALUATION REPORT (TMDER) Ref: NAVSEAINST 4160.3A NAVSEA S0005-AA-GYD-030/TMMP

NAVSEA/SPAWAR TECHNICAL MANUAL DEFICIENCY/EVALUATION REPORT (TMDER) INSTRUCTIONS: Continue on 8 ½” x 11” page if additional space is needed. 1.Use this report to indicate deficiencies, problems and recommendations relating to publications. 2.For CLASSIFIED TMDERs see OPNAVINST 5510H for mailing requirements. 3.For TMDERs that affect a separate TMDER for ea 4. Submit TMDERs at web site or mail to: COMMANDER, NAVSURFWARCENDIV NSDSA, 4363 MISSILE WAY, PORT HUENEME CA 93043-4307 1. PUBLICATION NUMBER

2. VOL/PART

3. REV/DATE OR CHG/DATE

5. TITLE OF PUBLICATION

,

4. SYSTEM/EQUIPMENT ID

6. REPORT CONTROL NUMBER (6 digit UIC-YY-any four: xxxxxx-03-xxxx)

7. RECOMMEND CHANGES TO PUBLICATION 7a. Page #

7b. Para #

7c. RECOMMENDED CHANGES AND REASONS

8. ORIGINATOR’S NAME AND WORK CENTER

9. DATE

10. ORIGINATOR’S E-MAIL ADDRESS

11. TMMA of Manual (NSDSA will complete)

12. SHIP OR ACTIVITY Name and Address (Include UIC/CAGE/HULL)

13. Phone Numbers: Commercial

(

NAVSEA 4160/1 (Rev. 7-2003)

S/N 0116-lf-985-4100

I-1/I-2 blank

-

-

DSN FAX

)

(

)

-

SCAR MK 17 TechnicalRepairStandard Redacted

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