Sw360-Ag-mmo-012 5.56mm Lightweight Machine Gun,Mk46 Mod 1 Feb. 2006

NAVY SW360-AG-MMO-012 SOFWEP-01-G10-00017-02

Operator’s Manual 5.56mm Lightweight Machine Gun, MK46 MOD1 NSN 1005-01-534-3682

DISTRIBUTION STATEMENT B: Distribution authorized to U.S. Government agencies to protect proprietary information 15 Feb 97. DESTRUCTIO DESTRUCTION N NOTICE – For unclassifi unclassified, ed, limited limited documents, documents, destroy destroy by any method that that will prevent disclosure of contents or reconstruction of the document. 28 February 2006 FN Manufacturing, LLC. P.O. Box 24257 Columbia, SC 29224


THIS PAGE INTENTIONALLY LEFT BLANK




Operator’s Manual 5.56mm Lightweight Machine Gun, MK46 MOD1 NSN 1005-01-534-3682

1.

Retain this sh sheet in in front of of ma manual fo for re reference pu purposes.

2.

Dates of issue for original and changes are: Original

28 February 2006


WARNINGS

1.

Be sure to clear weapon before disassembling, cleaning, inspecting, transporting or storing.

2.

Stay clear of muzzle and always keep weapon pointed downrange.

3.

Keep safety on until ready to fire.

4.

Before firing, make sure the barrel is locked tightly.

5.

Never remove trigger mechanism before weapon is cleared. Removal of the trigger mechanism from a loaded weapon will cause a runaway.

6.

Hot fired cartridge cases may strike right arm as they are ejected from the weapon when firing left-handed. Operators firing left-handed should not roll up right arm sleeve of clothing.

7.

Never open the cover of weapon if the barrel is hot and you suspect there is a live round in chamber. a


WARNINGS (cont) 8.

Always look into chamber after clearing weapon.

9.

With ammunition and weapon exposed to the sun on a hot sunny day a cook-off can occur with 50 rounds of continuous firing.

10.

Use only blank M200 Ammunition with the Blank Firing Attachment (BFA).

11

Do not interchange barrel assemblies (to include spare barrel) or bolt assemblies from one weapon to another without having headspace checked.

12.

Do not allow round to hit any hard surface or it may fire. Dispose of live rounds appropriately.

13.

Do not modify components, use repair parts, or interchange components other than those authorized by this manual. This includes other models of machine guns or foreign versions of this weapon.

14.

Never reload a runaway weapon until it has been repaired or replaced. b


WARNINGS (cont) 15.

Ensure moving part components are in the forward position.

16.

If nothing is ejected and barrel is hot (200 rounds fired within a 2 minute period); DO NOT open the cover, push safety to right (red band not visible). Keep weapon pointed down range, and remain clear for 15 minutes, clear your weapon.

17.

The firing of long sustained bursts of greater than 25 rounds or a continuous firing of approximately 200 rounds will present a danger of “cook off” in the event a malfunction occurs; and will accelerate the wearing out of the barrel.

18.

Never remove a hot barrel to clear malfunction. Wait 15 minutes for barrel to cool.

19.

Blank ammunition should not be fired toward personnel within 20 feet or less from the muzzle because fragments of a closure wad or particles of unburnt propellant may inflict injury within that range.

20.

All personnel shall wear approved single hearing protection devices during training exercises. c


WARNINGS (cont)

21.

Sound Suppressor Kit; refer to Special Operations Peculiar Modifications Accessories kit ST 23-31-1 and heed all Warnings, Cautions, and Notes pertaining to the use and maintenance of sound suppressor.

22.

When the Lower Pin (pivot) retention is not positively retained it can work loose during firing. If it works completely out, the Trigger Mechanism can separate from the weapon. Separation of the Trigger Mechanism when the weapon is loaded will create a runaway weapon.

23.

Ensure barrel is not obstructed by water and mud.

d

CAUTIONS


1. Rotate usage of Barrel Assemblies to minimize wear. 2. The weapon can be manipulated to the close bolt on a empty chamber and placed the safety in the on position (red band not visible). However, doing so renders the weapon not “Combat Ready” and if bolt is mistakenly charged when ammunition has been loaded with the safety on, damage to the weapon and/or ammunition can occur. 3. DO NOT use tools to tighten Blank Firing Attachment, hand tighten only. 4. Ensure barrel(s) is not obstructed by water or mud. 5. To avoid damage to equipment, DO NOT use dry cleaning solvent on plastic components, sealed buffer, etc. 6. DO NOT use abrasives to clean the bore, piston, gas cylinder, or gas block. 7. DO NOT lubricate chrome areas of piston, gas cylinder, or gas block. 8. Be sure to clean your barrel(s) bore from chamber end to the muzzle end with barrel removed from weapon. e

CAUTIONS (cont)


9. Improper assembly of the transfer mechanism can cause damage to the receiver and/or the assembly itself. If the horizontal pins of the transfer assembly are not placed on the hooks, inside the receiver, when the buttstock is pivoted in the up position for pinning, the receiver hooks can be bent. If the horizontal pins of the transfer assembly are rotated to the vertical position and the bottom pin is hooked into the lightening hole in the bottom of the receiver, the pin can be sheared, damaged or lost when weapon is fired. 10. If ammunition is wet or dirty, wipe it off with a dry rag prior to use. Do not lubricate ammunition. Dust and other abrasives that collect on oily ammunition are damaging to operating parts of the weapon. Lubricated cartridges produce excessive chamber pressure. 11. Never touch a Hot Barrel.

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Operator’s Manual 5.56mm Lightweight Machine Gun, MK46 MOD1 (NSN 1005-01-534-3682)

DISTRIBUTION STATEMENT B: Distribution authorized to U.S. Government agencies to protect proprietary information 15 Feb 97. DESTRUCTION NOTICE – For unclassified, limited documents, destroy by any method that will prevent disclosure of contents or reconstruction of the document.

FN Manufacturing, LLC P.O. Box 24257 Columbia, SC 29224

i


REPORTING ERRORS AND RECOMMENDING IMPROVEMENTS Errors in this publication or recommendations for its improvement shall be Submitted to: Commander Crane Division Naval Surface Warfare Center Attn; Code 4081, Bldg 2521 300 Highway 361 Crane, IN. 47522

ii


TABLE OF CONTENTS CHAPTER 1 Section I

Section II

INTRODUCTION General Information 1.1 Scope 1.2 Corrosion, Prevention and Control 1.3 Reporting Equipment Improvement Recommendations (EIR) Equipment Description 1.4 Equipment Characteristics, Capabilities and Features 1.5 Location and Description of Major Components 1.6 Equipment Data

iii

PAGE 1-1 1-3 1-3 1-4

1-5 1-5 1-6 1-12


CHAPTER 2 Section I

Section II

OPERATING INSTRUCTION INSTRUCTI ON Preventative Maintenance Checks and Services (PMCS) 2.1 Preventative Maintenance Checks and Services (PMCS) Operation of Weapon 2.2 Operation of Weapon 2.3 Loading 2.4 Clearing 2.5 Field Zero, Rear Sight 2.6 Field Zero, Front Sight 2.7 Confirmation of Battlefield Zero 2.8 Immediate Action 2.9 If Immediate Action Does Not Work 2.10 Stuck Cartridge Case or Live Round 2.11 Runaway Machine Gun 2.12 Barrel Assembly 2.13 Bipod Positioning and Stowage 2.14 Accessory 2.14.1 Stock Assembly, Collapsible 2.14.2 100 Round Assault Magazine 2.14.3 Blank Firing Attachment (BFA) 2.14.4 Blank Firing Barrel (BFB) 2.14.5 Sound Suppressor (SOPMOD) iv

PAGE 2-1 2-2 2-11 2-11 2-12 2-18 2-22 2-27 2-30 2-31 2-33 2-34 2-38 2-39 2-40 2-42 2-42 2-44 2-47 2-50 2-51


CHAPTER 2 Section III

OPERATING INSTRUCTION INSTRUCTIO N (cont) Operation Under Unusual Condition 2.15 Environment/Weather (Protective Measures) 2.15.1 Exposure to Water-Mud 2.15.2 Hot-Wet/Salt Air 2.15.3 Hot-Dry-Sand-Dust 2.15.4 Cold-Ice-Snow

CHAPTER 3 Section I

MAINTENANCE INSTRUCTION INSTRUCT ION Lubrication Instructions 3.1 Lubrication Guide Troubleshooting Procedures 3.2 Troubleshooting Maintenance Procedures 3.3 Field Strip (Disassembly) 3.3.1 Sling & Snap Hook Assembly 3.3.2 Cover, Feed Mechanism Assembly 3.3.3 Buttstock w/Hydraulic Buffer 3.3.4 Trigger Assembly 3.3.5 Drive Spring & Return Rod Transfer Mechanism

Section II Section III

v

PAGE 2-53 2-53 2-55 2-55 2-56 2-56

3-1 3-1 3-3 3-3 3-16 3-16 3-16 3-17 3-18 3-19 3-20


CHAPTER 3

MAINTENANCE INSTRUCTION (cont) 3.3.6 Moving Parts (Operating Rod, Slide Assembly & Bolt Assembly) 3.3.7 Barrel Assembly 3.3.8 Gas Cylinder Assembly 3.3.9 Bipod Assembly 3.4 Cleaning, Inspection and Repair 3.5 Field Strip (Assembly) 3.5.1 Bipod Assembly 3.5.2 Gas Cylinder Assembly 3.5.3 Barrel Assembly, Fluted 3.5.4 Moving Parts (Operating Rod, Slide Assembly & Bolt Assembly) 3.5.5 Drive Spring & Return Rod Transfer Mechanism 3.5.6 Trigger Assembly 3.5.7 Buttstock Assembly w/Hydraulic Buffer 3.5.8 Cover, Feed Mechanism Assembly 3.5.9 Sling & Snap Hook Assembly 3.6 Function Check

vi

PAGE 3-21

3-22 3-23 3-24 3-25 3-42 3-42 3-43 3-44 3-45 3-48 3-50 3-51 3-53 3-54 3-55


CHAPTER 4 Section I

MAINTENANCE OF AUXILIARY EQUIPMENT Auxiliary Equipment 4.1 Blank Firing Attachment (BFA) 4.2 Stock Assembly, Collapsible (Accessory) 4.3 Magazine, Cartridge (100 Rd) 4.4 Accessory Kit Components (SOPMOD)

CHAPTER 5

AMMUNITION

PAGE 4-1 4-1 4-1 4-1 4-2

5-1

APPENDIX A Basic Issue Items (BII) Lists Section I Scope Section II Basic Issue Items

A-1 A-4

APPENDIX B Additional Authorized List Section I Scope Section II Additional Authorized List

B-1 B-3

APPENDIX C Expendable/Durable Supplies and Materials List Section I Scope Section II Expendable/Durable Supplies and Materials List vii

C-1 C-3



viii


FRONT SIGHT

CHAPTER 1 INTRODUCTION Section I. General Information BARREL LATCH

FEED TRAY

TRIGGER MECHANISM ASSEMBLY

RECEIVER ASSEMBLY

LEFT SIDE 1-1

BUTTSTOCK W / HYDRAULIC BUFFER


HEAT SHIELD BARREL ASSEMBLY (FLUTED)

COVER ASSEMBLY REAR SIGHT ASSEMBLY

BIPOD ASSEMBLY

CHARGING HANDLE ASSEMBLY

LOWER RAIL ADAPTER

RIGHT SIDE 1-2


1.1 SCOPE

A. Type of Manual: Operator’s Manual. B. Model number and equipment name: 5.56mm, Lightweight Machine Gun, MK46 MOD1 w/equipment. C. Purpose of equipment: The MK46 MOD 1 machine gun is designed as a fire team automatic weapon providing suppressive fire at extended ranges allowing fire and movement to make contact with and destroy the enemy. 1.2 CORROSION, PREVENTION AND CONTROL (CPC)

CPC of material is a continuing concern. It is important any corrosion problems with 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 of 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 result of a corrosion problem.

1-3


1.3 REPORTING EQUIPMENT IMPROVEMENT RECOMMENDATIONS (EIR)

If your machine guns need improvement, let us know. You, as the users, are the only ones who can tell us what you don’t like about your equipment. Let us know why you don’t like the design or performance. Tell us why a procedure is hard to perform. A reply will be furnished directly to you. Report to: Commander Crane Division Naval Surface Warfare Center Attn: Code 4081, Bldg 2521 300 Highway 361 Crane, IN. 47522

1-4


Section II. EQUIPMENT DESCRIPTION 1.4 EQUIPMENT CHARACTERISTICS, CAPABILITIES AND FEATURES A. CHARACTERISTICS: The MK46 MOD1 Machine Gun is belt-fed, gas-operated, air-cooled, and fires from the open bolt position.

B. CAPABILITIES: The MK46 MOD1 Machine Gun can be used as a Light Machine Gun (LMG). It can be fired from the shoulder, hand-held, or bipod steadied (prone) positions. It has two (2) barrel assemblies to extend the life of the barrels, retain accuracy, and allow for continuous firing over long periods o time.

C. FEATURES: The quick-change barrel is air-cooled and has a fixed headspace. The bolt is a multiple-lug type which rotates into a positive locked position in the barrel extension prior to firing. Gas is taken from the barrel acting on a piston directly to the bolt carrier (slide). The barrel has a preset gas orifice. The MK46 MOD1 is equipped with a spare barrel in addition to the main barrel. The weapon contains four (4) integrated rail systems per MIL-STD-1913 capable of mounting various electrooptical devices.

1-5


1.5 LOCATION AND DESCRIPTION OF MAJOR COMPONENTS

Major Components of the Machine Gun are: 1. Barrel Assembly

Houses cartridge for firing, directs projectile, and supports fixed front sight. Compensator minimizes muzzle flash, reduces muzzle climb. Allows for easy attachment or detachment of SOPMOD sound suppressor.

2. Lower Rail Adapter

Allows easy attachment or detachment for mounting of various SOPMOD electro-optical devices on three (3) independent rails.

3. Receiver Assembly

Serves as a support for all major components. Houses action of weapon and through a series of guide rails, controls functioning of weapon.

4. Rear Sight Assembly

Rear sight is adjustable for both windage and elevation.

1-6


1.5 LOCATION AND DESCRIPTION OF MAJOR COMPONENTS (cont)

Major Components of the Machine Gun are: (cont) 5. Cover and Feed Mechanism Assembly

Provides support for rear sight and means for gaining access to feed tray. By means of cam and lever action, feeds linked ammunition and holds cartridges in position for feeding and chambering. Cover also provides for ease of attachment or detachment for mounting various SOPMOD electrooptical devices.

6. Feed Pawl Assembly

Feeds linked belt ammunition, positions and holds cartridges in position for stripping and feeding.

7. Feed Tray Assembly

Serves as a guide for positioning cartridges and assists in chambering.

8. Cocking Handle Assembly

Pulls the moving parts rearward. Moves in a guide rail fixed to the right side of receiver. 1-7



Major Components of the Machine Gun are: (cont) 9. Buttstock Assembly w/Hydraulic Buffer

Serves as a shoulder support for aiming and firing machine gun. Contains a hydraulic buffer for absorbing recoil energy.

10. Bolt Assembly

Provides feeding, chambering, firing, and extraction, using the propellant gases and recoil spring for power.

11. Slide Assembly

Houses the bolt assembly, firing pin and roller assembly and cams bolt assembly to lock and unlock.

12. Piston Assembly

Transfers power from propelling gases to bolt and slide assemblies to function the machine gun (move recoiling-parts rearward).

13. Spring, Helical Compression

Provides power to the piston assembly for moving slide and bolt assemblies forward during weapon functioning. 1-8



Major Components of the Machine Gun are: (cont) 14. Return Rod and Transfer Mechanism Assembly or Rod Assembly, Operating

Absorbs recoil from bolt, slide and piston assemblies at the end of recoil movement, and transfers recoil pressure to the buffer in the buttstock.

15. Trigger Mechanism Assembly

Houses the trigger, sear, safety, and controls the firing of the machine gun.

16. Sling and Snap Hook Assembly

Provides a means of carrying the weapon.

17. Bipod, Assembly

Supports machine gun in prone position. The two (2) telescopic legs can be individually adjusted to three (3) different lengths..

1-9



Major Components of the Machine Gun: (cont) 18. Gas Cylinder Assembly

Locks bipod in place on receiver and provides passageway for operating gases.

19. 11 Rib Rail Cover Assembly

Allows easy attachment/detachment on Lower Rail Adaptors. Provides heat protection for hands.

20. Heat Shield Assembly

Protects hands and other items from being burnt when coming onto contact with a hot barrel.

NOTE: FOR BASIC ITEMS OF ISSUE (BII), See Appendix A

1-10

NAVY SW360-AG-MMO-012 SOFWEP-01-G10-00017-02 20

EXPLODED VIEW 4

5 6

1

3 7

9 18 2

15 14 13

17 10

8 Not shown

11 12

19

16

1-11


1.6 EQUIPMENT DATA

Complete Weapon System

7.02 kg (15.44 lbs.)

Included in Complete Weapon System: Fluted Barrel Assembly Titanium Bipod Assembly Fixed Buttstock Sling Assembly Miscellaneous Accessories Blank Firing Attachment (BFA) Rib, Rail Cover (4 each) Collapsible Buttstock Assembly w/Hydraulic Buffer 200 rd. Ammo Box (Filled) 100 rd. Assault Magazine (Filled)

1-12

1.49 kg (3.28 lbs.) 0.42 kg (0.94 lbs.) 0.63 kg (1.39 lbs.) 0.23 kg (0.52 lbs.)

0.08 kg (0.17 lbs.) 0.10 kg (0.22 lbs.) total 0.72kg (1.58 lbs.) 3.14 kg (6.92 lbs.) 1.36 kg (3.00 lbs.)


1.6 EQUIPMENT DATA (cont) Length Overall Weapon (w/o BFA) Barrel Assembly Rifling Twist (RH)

920.0 mm (36.22 in.) 414.0 mm (16.30 in.) 1 turn in 7 inches

Rate of Fire Cyclic Sustained (3-5 burst, 4-5 seconds between bursts) Rapid (8-10 rd burst, 2-3 seconds between bursts)

750 rds / min 85 rds / min 100 rds / min

NOTE RECOMMEND BARREL CHANGE AFTER FIRING 200 ROUNDS OF CONTINUOUS FIRING TO ENSURE MAXIMUM BARREL LIFE

1-13


1.6 EQUIPMENT DATA (cont) Range Maximum Maximum Effective

1,800 meters 800 meters (Tracer Burnout)

Sights Front Rear

Semi-fixed hooded type post Fully adjustable peep type for elevation and windage Attaches various sights by means of grooved dove tail feature.

4 Integrated Rail System

1-14


CHAPTER 2 OPERATING INSTRUCTIONS Section I.

PREVENTATIVE MAINTENACE CHECKS AND SERVICES (PMCS) WARNING

BE SURE TO CLEAR WEAPON BEFORE DISASSEMBLY, CLEANING, INSPECTING, TRANSPORTING OR STORING. THE FIRING OF LONG SUSTAINED BURSTS OF GREATER THAN 25 ROUNDS OR A CONTINUOUS FIRING OF APPROXIMATELY 200 ROUNDS WILL PRESENT A DANGER OF “COOK-OFF” IN THE EVENT A MALFUNCTION OCCURS; AND WILL ACCELERATE THE WEARING OUT OF THE BARREL.

2-1


2.1 PREVENTATIVE MAINTENANCE CHECKS AND SERVICES (PMCS) Item No.

1

Interval

Location Item to

Procedure

Check/Service

Before

Machine Gun 5.56; MK46 Mod 1 W / Basic Items of Issue

Visually check for missing or damaged components.

Not Fully Mission Capable if:

M.G., MK46 MOD 1 includes; Bipod Assembly, Softpak Cleaning Kit

WARNING DO NOT INTERCHANGE BARREL ASSEMBLIES (TO INCLUDE SPARE BARREL) OR BOLT ASSEMBLIES FROM ONE MACHINE GUN TO ANOTHER WITHOUT HAVING HEADSPACE CHECKED. DOING SO MAY RESULT IN INJURY TO PERSON OR DAMAGE TO WEAPON. CAUTION ROTATE USAGE OF THE BARREL ASSEMBLIES TO MINIMIZE WEAR. 2-2


2.1 PREVENTATIVE MAINTENACE CHECKS AND SERVICES (PMCS) (cont) Item No. Interval Location Procedure Not Fully Item to Check/Service Mission Capable If: 1 Before Machine Gun, 5.56mm: Visually check for Includes; (cont) MK46 MOD1 missing or Scraper Assy W / Basic Items of Issue damaged Wrench, Spanner components Operator Manual Blank Firing Attachment (BFA) Sling and Snap Hook Assy Barrel Assy (spare) Carrying Case, Barrel **Front Sight Adjusting Tool ** 1 for each 4 weapons

2-3


2.1 PREVENTATIVE MAINTENACE CHECKS AND SERVICES (PMCS) (cont) Item No. Interval Location Procedure Not Fully Item to Check/Service Mission Capable If: 2 Before Barrel Remove barrel; a. An Assembly (fluted) check bore and obstruction in chamber barrel cannot be removed. Using cleaning rod assembly and swab, remove lubricant, foreign material or obstructions Install and lock b. Barrel will barrel assembly not lock securely securely in in receiver. receiver (Spare barrel must also be checked before use)

2-4


2.1 PREVENTATIVE MAINTENACE CHECKS AND SERVICES (PMCS) (cont) Item No. Interval Location Procedure Not Fully Item to Check/Service Mission Capable If: 3 After Barrel Clear weapon; a. Obstruction in Assembly (fluted) check chamber and barrel cannot be bore for removed obstructions

Install and lock b. Barrel will barrel assembly not lock securely securely in in receiver. receiver (Spare barrel must also be checked before use) NOTE WHEN A BARREL IS REMOVED DURING EXTENDED FIRING MISSIONS, LUBRICATION SHOULD BE REAPPLIED AFTER COOLING PERIOD.

2-5


2.1 PREVENTATIVE MAINTENACE CHECKS AND SERVICES (PMCS) (cont) Item No. Interval Location Procedure Not Fully Item to Check/Service Mission Capable If: 4 Before Cover, Feed Mechanism Squeeze cover a. Latches fail latches and raise to hold cover cover. Let go of shut. latches and close b. Catch and cover. Inspect spring fails to cover assembly to hold cover ensure it will assembly remain fully fully open. opened.

2-6


2.1 PREVENTATIVE MAINTENACE CHECKS AND SERVICES (PMCS) (cont) Item No. Interval Location Procedure Not Fully Item to Check/Service Mission Capable If: 5 Before Cocking With palm up pull Cocking handle Handle cocking handle does not fully Assembly rearward to charge charge weapon. weapon. Confirm that bolt assembly moves freely without binding and locks to rear. 6 Before Safety With bolt The bolt assembly locked to assembly moves the rear (cocked forward with the position), push safety engaged. safety to “SAFE” (RED BAND not visible). Pull trigger; bolt assembly should not move forward. 2-7


2.1 PREVENTATIVE MAINTENACE CHECKS AND SERVICES (PMCS) (cont) Item No. Interval Location Procedure Not Fully Mission Item to Capable If: Check/Service

7

Before

Bolt Assembly

While charging a. Bolt assembly binds weapon, confirm that in receiver. bolt assembly moves b. Bolt assembly fails to freely without binding lock in cocked and locks in cocked position. position.

NOTE ENSURE PROPER LUBRICATION HAS BEEN APPLIED TO THE WEAPON.

8

After

If cyclic rate slows down or weapon becomes sluggish; clear, clean and lubricate weapon.

2-8

a. Cleaning and lubricating weapon does not improve functioning. b. Forward to unit armorer for corrective action as soon as possible if weapon does not function properly.


2.1 PREVENTATIVE MAINTENACE CHECKS AND SERVICES (PMCS) (cont) Item No. Interval Location Procedure Not Fully Item to Check/Service Mission Capable If: 9 After Machine Clear, a. Any part to Gun, LMG disassemble, clean, include the inspect, lubricate, spare barrel reassemble and assembly is function check broken weapon. missing or damaged to the extent that it could cause the weapon to malfunction. b. Spare barrel assembly is not accompanying the weapon.

2-9


2.1 PREVENTATIVE MAINTENACE CHECKS AND SERVICES (PMCS) (cont) Item No. Interval Location Procedure Not Fully Item to Check/Service Mission Capable If: 10 Before Sling & Snaphook Visually inspect Forward to unit Assembly for improperly armorer for assembled, broken, corrective action. missing or damaged parts appearance.

2-10


Section II. OPERATION OF THE WEAPON 2.2 OPERATION OF THE WEAPON WARNING THE FIRING OF LONG SUSTAINED BURSTS OF GREATER THAN 25 ROUNDS OR A CONTINUOUS FIRING OF APPROXIMATELY 200 ROUNDS WILL PRESENT A DANGER OF “COOKOFF” IN THE EVENT A MALFUNCTION OCCURS; AND WILL ACCELERATE THE WEARING OUT OF BARRELS. COCKING HANDLE (FORWARD POSITION)

With palm up, charge weapon by pulling cocking handle to rear, to lock bolt (cock weapon). Push cocking handle forward until you hear it click. Push safety to right (RED BAND Not Visible).

SAFETY OPPOSITE SIDE VIEW

2-11


2.3 LOADING COVER ASSEMBLY Squeeze latches to open cover assembly COVER LATCHES

CHAMBER

Raise Feed Tray Assembly. Look into chamber to make sure there is no round chambered. Lower Feed Tray Assembly. 2-12


2.3 LOADING (cont)

Attach 100-round semi rigid ammunition pack containing link belt to underside of receiver, after aligning box/magazine latch with receiver dovetail.

DOVE TAIL

100 ROUND SEMI RIGID AMMUNITION PACK

Pull outward on ammunition box or magazine to ensure that the aligning box/magazine latch is engaged 2-13


2.3 LOADING (cont) NOTE DURING TRAINING EXERCISES WHERE BROKEN (SHORTENED) BELTS ARE USED AND THE LEAD LINK TAB IS NOT AVAILABLE, THE LEAD ROUND SHOULD BE STRIPPED FROM THE LINK. PLACE THE OPEN LINK WELL ONTO THE FEED TRAY UNTIL THE FIRST ROUND IS AGAINST THE CARTRIDGE STOP. THE OPEN SIDE OF LINKS IS DOWN .

Place link belt in feed tray assembly with first round against cartridge stop. Feed pawls will hold belt in the proper position. Close cover assembly.

2-14


2.3 LOADING (cont) Loading Using Feeder Strap Attach first link of belt to feeder strap as shown. NOTE: IT MAY BE NECESSARY TO REMOVE THE FIRST BULLET TO HAVE A LINK AVAILABLE TO ATTACH THE FEEDER STRAP. Charge Weapon and place safety in safe position (red line not visible). Push charging handle forward to locked position. Insert Feeder Strap from left side as shown.

Push Feeder Strap into weapon until it protrudes from right side as shown.

2-15


2.3 LOADING (cont) Loading Using Feeder Strap (cont)

Pull Feeder Strap to right until white line can be seen from right side of weapon as shown.

The weapon is now loaded. Note: When the first round is fired the Feeder Strap will be ejected from the weapon. White line indicating first round is properly positioned

2-16


2.3 LOADING (cont)

WARNING YOUR WEAPON IS NOW COMBAT READY, E.G., AMMUNITION LOADED, BOLT TO THE REAR AND SAFETY ON (RED BAND NOT VISIBLE).

CAUTION THE WEAPON CAN BE MANIPULATED TO CLOSE THE BOLT ON AN EMPTY CHAMBER AND PLACE THE SAFETY IN THE ON POSITION (RED BAND NOT VISIBLE). HOWEVER, DOING SO RENDERS THE WEAPON NOT "COMBAT READY", AND IF THE BOLT IS MISTAKENLY CHARGED WHEN AMMUNITION HAS BEEN LOADED WITH THE SAFETY ON, DAMAGE TO THE WEAPON AND/OR AMMUNITION CAN OCCUR.

2-17


2.4 CLEARING

Charge weapon (pull cocking handle rearward). Be sure bolt is locked in rear position. Push charging handle forward until you hear it click.

SAFETY COCKING HANDLE (FORWARD POSITION)

Push safety to right (RED BAND not visible).

2-18


2.4 CLEARING (cont) COVER ASSEMBLY

Squeeze latches to open cover assembly. Remove ammunition belt and loose links.

AMMUNITION BELT

2-19


2.4 CLEARING (cont) NOTE WHEN CLEARING THE WEAPON, ENSURE THE CLEANING ROD DOES NOT TOUCH THE EJECTOR.

Raise feed tray assembly. Look into chamber. Round still in Chamber? Remove it. A cleaning rod (30”) may be used to ensure barrel and chamber is cleared.

CHAMBER

Receiver/Cavity/Chamber empty? Lower feed tray assembly. Close Cover assembly. Make sure it locks shut.

2-20


2.4 CLEARING (cont)

Push safety to left (RED BAND visible). Hold cocking handle to rear, pull trigger, and ride bolt forward to close and lock. NOTE WHEN CLEARING THE WEAPON AFTER USE, ENSURE THE CLEANING ROD USED FOR CLEARING DOES NOT TOUCH THE EJECTOR

2-21


2.5 FIELD ZERO, REAR SIGHT NOTE

WEAPON AND BOTH BARREL ASSEMBLIES HAVE BEEN ZEROED AT 300 METERS PRIOR TO SHIPMENT. REAR SIGHT WINDAGE ADJUSTMENT: EACH SIGHT MAY VARY AS TO HOW MANY CLICKS ARE NEEDED TO CENTER THE SIGHT. TO CHECK YOUR SIGHT, START WITH THE SIGHT LEAF ALL THE WAY TO THE LEFT; COUNTING THE CLICKS, ROTATE THE WINDAGE KNOB (FRONT KNOB) UNTIL THE SIGHT LEAF STOPS ON THE RIGHT SIDE. DIVIDE THE NUMBER OF CLICKS BY TWO AND MOVE LEAF SIGHT LEFT TO CENTER-EXAMPLE: 24 CLICKS=12 TO CENTER; EXAMPLE: 23 CLICKS = 12 TO CENTER (11+12=23, USE LARGER FIGURE).

To field zero your machine gun for windage, you must first center your rear sight leaf (see note above).

WINDAGE KNOB 2-22

2.5 FIELD ZERO, REAR SIGHT (cont)


NOTE TO MAKE THE PEEP SIGHT EASIER TO GRASP WITH FINGERS OR SPANNER WRENCH, ROTATE THE ELEVATION KNOB (REAR KNOB) TO THE “10” (1000 METER) MARK. AFTER ADJUSTMENT, MOVE THE ELEVATION KNOB BACK TO ORIGINAL POSITION.

REAR SIGHT ELEVATION ADJUSTMENT: EACH SIGHT MAY VARY AS TO HOW MANY CLICKS ARE NEEDED TO CENTER THE SIGHT. TO CHECK THE SIGHT, START WITH THE PEEP SIGHT POST ALL THE WAY TO THE TOP; COUNTING THE CLICKS, SCREW IT DOWN AS FAR AS IT WILL GO. DIVIDE THE NUMBER OF CLICKS BY TWO AND MOVE PEEP SIGHT TO CENTER – EXAMPLE: 13 CLICKS = 7 TO CENTER (6 + 7 = 13, USE LARGER FIGURE).

To field zero your machine gun in elevation, you must center your peep sight (see note above).

2-23



PEEP SIGHT

ELEVATION KNOB

Rotate the elevation knob (rear knob) to the desired range. Fire a 3-5 round burst on the center of the target. NOTE EACH NUMBER (3 TO 10) ON THE ELEVATION SCALE STANDS FOR 100 METERS. THE MARKS BELOW “3” ON THE RIGHT HAND SCALE ARE 500, 700 AND 900 METERS RESPECTIVELY.

2-24



NOTE EACH CLICK OF THE WINDAGE KNOB (FRONT KNOB) MOVES THE SIGHT 1/2 MIL, AND THE GROUP ON THE TARGET; 6 INCHES (15.24 CENTIMETERS) AT 300 METERS 10 INCHES (25.4 CENTIMETERS) AT 500 METERS.

Make windage and elevation corrections as follows: • • • •

To move group right: Turn windage knob (front knob) counterclockwise (CCW). To move group to left: Turn windage knob (front knob) clockwise (CW) To raise the group: Turn peep sight counterclockwise (CCW). To lower the group: Turn peep sight clockwise (CW). Fire another group. Repeat above procedures until zeroed.

2-25



NOTE IF THE WEAPON CANNOT BE ZEROED IN ELEVATION, AND THE PEEP SIGHT IS SCREWED ALL THE WAY IN OR OUT, THE FRONT SIGHT POST CAN BE ADJUSTED UTILIZING THE SPANNER WRENCH. CENTER YOUR PEEP SIGHT IN ELEVATION AND FIRE A BURST OF 3-5 ROUNDS FOR A SHOT GROUP. RE-ADJUST AS REQUIRED UNTIL DESIRED ZERO IS OBTAINED.

2-26


2.6 FIELD ZERO, FRONT SIGHT

NOTE RE-ZEROING WEAPON MAY BE REQUIRED WHEN GUNNER HAS PROBLEM ZEROING WEAPON FOR ELEVATION. ONLY ADJUST FRONT SIGHT IN WINDAGE OR ELEVATION IF WEAPON CANNOT BE ZEROED BY THE ADJUSTMENTS ON THE REAR SIGHT ASSEMBLY.

FRONT SIGHT ELEVATION ADJUSTMENT: Install Wrench, Spanner through hole in top of Front Sight housing with notched groove inserted over flats of Front Sight Post. To raise the impact group, screw the Sight post down clockwise (CW). To lower the impact group, screw the Sight post up counterclockwise (CCW). NOTE EACH ½ TURN OF THE SIGHT POST IS EQUAL TO 1 MIL OF ELEVATION. EACH MIL OF ELEVATION MOVES THE GROUP ON THE TARGET APPROXIMATELY 30CM (12 INCHES) AT 300 METERS.

CW

2-27

CCW

2.6 FIELD ZERO, FRONT SIGHT (cont)


NOTE REZEROING WEAPON MAY BE REQUIRED WHEN GUNNER HAS PROBLEM ZEROING WEAPON FOR WINDAGE. FRONT SIGHT WINDAGE ADJUSTMENT: Ensure Knurled Knob is screwed back to clear Gas Block Housing. Install Adjusting Tool on Sight Base, Knurled Knob on left side of barrel. Insert Pin, Locator into spring pin cavity. Screw Knurled Knob until tension is felt against Gas Block Housing. Turn Knurled Knob (CW) against Gas Block Housing and listen for clicks, Sight Base will move to the left. NOTE EACH CLICK = 0.5 MIL OF MOVEMENT

PIN LOCATOR

SIGHT BASE

KNURLED KNOB

GAS BLOCK HOUSING

2-28

2.6 FIELD ZERO, FRONT SIGHT (cont)


Ensure Knurled Knob is screwed back to clear Gas Block Housing. Install Adjusting Tool on Sight Base on right side of barrel. Insert Pin, Locator into spring pin cavity. Screw Knurled Knob until tension is felt against Gas Block Housing. Turn Knurled Knob (CW) against Gas Block Housing and Listen for clicks, Sight Base will move to the right.

NOTE EACH CLICK = 0.5 MIL OF MOVEMENT PIN LOCATOR

SIGHT BASE

SPRING PIN CAVITY (not shown)

KNURLED KNOB

GAS BLOCK HOUSING

2-29


2.7 CONFIRMATION OF BATTLEFIELD ZERO

Field Expedient Zeroing Distances

Elevation Setting

One ½ Turn Equals

25.4 meters (1000 inch)

300

2.54 cm (1 inch)

10 meters (10.94 yards)

700

1 cm (0.4 inch)

300 meters

300

30 cm (12 inches)

2-30


2.8 IMMEDIATE ACTION

If the weapon stops firing, take immediate action. Charge weapon and push cocking handle forward until you hear it click. If a round is ejected – FIRE AGAIN.

COCKING HANDLE

2-31


2.8 IMMEDIATE ACTION (cont) WARNING IF NOTHING IS EJECTED AND BARREL IS HOT (200 ROUNDS FIRED WITHIN A 2 MINUTE PERIOD); DO NOT OPEN THE COVER, PUSH SAFETY TO RIGHT (RED BAND NOT VISIBLE). KEEP WEAPON POINTED DOWN RANGE, AND REMAIN CLEAR FOR 15 MINUTES. AFTER 15 MINUTES, CLEAR YOUR WEAPON.

SAFETY

If nothing is ejected, look to see if any rounds remain on the feed tray assembly. If not, you have run out of ammunition. If the barrel is not hot, clear the weapon. 2-32


2.9 IF IMMEDIATE ACTION DOES NOT WORK

Be sure weapon is cleared. Check for: • Obstructions • Lubrication • Dirt • Damaged Parts Take corrective action as required. Reload, and fire again.

2-33


2.10 STUCK CARTRIDGE CASE OR LIVE ROUND WARNING STAY CLEAR OF MUZZLE. DO NOT ALLOW ROUND TO HIT ANY HARD SURFACE OR IT MAY FIRE. DISPOSE OF LIVE ROUND ACCORDINGLY.

SAFETY If it did fire and didn’t extract, you have a stuck cartridge case. If weapon can be charged, do so, push safety to right (RED BAND not visible). Remove barrel. 2-34


2.10 STUCK CARTRIDGE CASE OR LIVE ROUND (cont) NOTE IF YOU ARE UNABLE TO CHARGE THE WEAPON, BOLT MAY BE STUCK IN BARREL EXTENSION. WARNING IF YOU TRY TO CHARGE THE WEAPON AND THE COCKING HANDLE WILL NOT UNLOCK THE BOLT. PERFORM THE FOLLOWING STEPS: • KEEP MUZZLE POINTED DOWN RANGE. • PLACE CHARGING HANDLE AGAINST A SOLID OBJECT AND APPLY CONSTANT FORWARD PRESSURE TO MOVE COCKING HANDLE REARWARD TO UNLOCK. NOTE • DO NOT USE YOUR FOOT OR OTHER HEAVY OBJECTS TO FORCE CHARGING HANDLE TO THE REAR AS THIS CAN CAUSE DAMAGE TO THE WEAPON OR HARM TO THE OPERATOR. • BARREL MUST BE REMOVED TO PERFORM STUCK CARTRIDGE CASE REMOVAL. CLEANING 30" ROD

STUCK CARTRIDGE Insert Cleaning Rod 30” through muzzle end of barrel, use of Obstruction Remover is optional. Gently tap out stuck cartridge case.

2-35


2.10 STUCK CARTRIDGE CASE OR LIVE ROUND (cont)

RED BAND

SAFETY

If it didn’t fire and didn’t extract, you have a stuck live round. If weapon can be charged, do so. Push safety to left (RED BAND visible). Pull trigger; if it still doesn’t fire, wait until barrel is cool (approximately 15 min). If weapon can be charged, do so, and push safety to right (RED BAND not visible). Remove barrel.

2-36

2.10 STUCK CARTRIDGE CASE OR LIVE ROUND (cont)


NOTE IF YOU ARE UNABLE TO CHARGE THE WEAPON, BOLT MAY BE STUCK IN BARREL EXTENSION. WARNING IF YOU TRY TO CHARGE THE WEAPON AND THE COCKING HANDLE WILL NOT UNLOCK THE BOLT. PERFORM THE FOLLOWING STEPS: • KEEP MUZZLE POINTED DOWN RANGE. • PLACE CHARGING HANDLE AGAINST A SOLID OBJECT AND APPLY CONSTANT FORWARD PRESSURE TO MOVE COCKING HANDLE REARWARD TO UNLOCK. NOTE • DO NOT USE YOUR FOOT OR OTHER HEAVY OBJECTS TO FORCE CHARGING HANDLE TO THE REAR AS THIS CAN CAUSE DAMAGE TO THE WEAPON OR HARM TO THE OPERATOR. • BARREL MUST BE REMOVED TO PERFORM LIVE ROUND REMOVAL. OBSTRUCTION REMOVER

CLEANING 30" ROD

STUCK LIVE ROUND

Assemble cleaning rod (30”) with Obstruction Remover. Insert through muzzle muzzle end of barrel. Gently tap out live round. The weapon must be treated as though it has a live round in the chamber if the bolt is locked and it cannot be charged. If you experience experie nce this condition, forward to unit armorer for corrective correcti ve action.

2-37


2.11 RUNAWAY MACHINE GUN

If runaway occurs (weapon won’t stop firing), take action to correct corr ect it quickly. WARNING STAY CLEAR OF MUZZLE AND ALWAYS KEEP WEAPON POINTED DOWNRANGE.

Take either of the following actions: 1. Let weapon continue firing if near end of belt. 2. Grab cocking handle handle (palm up), pull all the way back and and hold. Push safety to right (RED BAND not visible); raise cover, remove link belt. 3. Twist belted ammunition or break links. li nks. WARNING NEVER RELOAD A RUNAWAY WEAPON UNTIL IT IS REPAIRED. BE SURE WEAPON IS CLEARED.

Forward to unit armorer for corrective action.

2-38


2.12 BARREL ASSEMBLY NOTE

WHEN THE BARREL IS REMOVED OR INSTALLED THE BOLT MUST BE LOCKED TO THE REAR WITH THE SAFETY PUSHED TO THE RIGHT (RED BAND NOT VISIBLE) VISIBLE)..

REMOVE: Clear weapon. Charge weapon and lock operating group to the rear, push the safety to the right (RED BAND Not Visible). Point muzzle muzzle downward, downward, depress depress barrel locking lever with left hand and lift the barrel out by the carrying handle. Return operating group to forward position. BARREL LOCKING LEVER WARNING DO NOT TOUCH HOT BARREL(S)

2-39


2.13 BIPOD POSITIONING AND STOWAGE

To fold the bipod rearward, hold the two legs together and bring them up under the barrel. When released they will lock into bipod stowed position.

Positioning of Legs for Stowage

2-40


2.13 BIPOD POSITIONING AND STOWAGE (cont)

To operate the weapon from the bipod, push down on either legs to rotate to the vertical position. To return the Bipod to the stowed position, squeeze legs together and rotate legs upward toward the receiver. To extend Bipod Leg pull downward. To retract Bipod Leg depress Bipod Latch while pushing leg upward. Each leg is adjustable to 3 different lengths.

BIPOD LATCH

(one each side)

2-41


2.14 ACCESSORY 2.14.1 STOCK ASSEMBLY, COLLAPSIBLE To shorten the overall length of the weapon, pull back on buttplate, twist to the left (counterclockwise), and push buttplate fully forward. Extended Position

Closed Position

2-42


2.14 ACCESSORY (cont) 2.14.1 STOCK ASSEMBLY, COLLAPSABLE (cont) When shoulder rest firing is required, pull shoulder rest to the rear and up. Shoulder rest is secure when it snaps into notches at the top of the buttstock .

SHOULDER REST

2-43


2.14 ACCESSORY (cont) 2.14.2 100 ROUND ASSAULT MAGAZINE NOTE

THE FOLLOWING INSTRUCTIONS ARE FOR LOADING TWO REUSABLE 100 ROUND MAGAZINES.

1.

2.

With canvas up, unzip 100 round magazine, remove the reusable plastic feed strap and attached link packed inside (these are spares and should be kept for future use). Note the silhouette of a cartridge on the inside of the plastic.

100 ROUND ASSAULT MAGAZINE

Remove 200 round ammo belt from disposable container. Determine the center point of the belt (holding the loose ends together) and by twisting, separate it into two belts of approximately equal length. 100 ROUND SEMI RIGID ASSAULT PACK

2-44


2.14 ACCESSORY (cont)

2.14.2 100 ROUND ASSAULT MAGAZINE (cont)

3. By twisting, remove the plastic feed strap and first link from the first cartridge. With the cartridges pointing as the silhouette depicts, insert several rounds from the inside of the magazine through the feed opening (the first cartridge will have no open link loops). Turn the magazine, plastic up, check for proper cartridge position as the silhouette depicts, and reattach the feed strap and link to the first cartridge. 4. Using moderate pressure to overcome the spring force, push belt back into magazine until the feed strap seats into the feed opening. 5. Turn magazine canvas up and fold the ammo belt back and forth so that it fits inside the magazine, close the zipper, and secure the snap on the zipper pull.

2-45


2.14 ACCESSORY (cont) 2.14.2 100 ROUND ASSAULT MAGAZINE (cont)

6. The reusable 100 round magazine is now ready for use and for attachment to the weapon. 7. To load the second magazine, repeat step one. 8. With the cartridges pointing as the silhouette depicts, insert several rounds from the inside of the magazine through the feed opening (the first cartridge will have no open link loops). Turn the magazine, plastic up, and attach the supplied feed strap and link to the first cartridge. 9. Follow the procedures in steps four and five above. 10. After use, save feed strap and attached link for future use.

2-46


2.14 ACCESSORY (cont) 2.14.3 BLANK FIRING ATTACHMENT (BFA)

WARNING USE ONLY BLANK M200 AMMUNITION WITH THE BFA. DO NOT FIRE BLANK AMMUNTION TOWARD PERSONNEL WITHIN 20 FEET OF THE MUZZLE. CAUTION DO NOT USE TOOLS TO TIGHTEN ATTACHMENT, HAND TIGHTEN ONLY.

2-47


2.14 ACCESSORY (cont) 2.14.3 BLANK FIRING ATTACHMENT (BFA) (cont)

1- Unscrew the restrictor tube and slide it all the way back.

2- Hook in forward groove of compensator

2-48

3- Insert resistor tube into the muzzle end of compensator. Screw in resistor tube until contact is made. Hand tighten.


2.14 ACCESSORY (cont) 2.14.3 BLANK FIRING ATTACHMENT (BFA) (cont)

NOTE AFTER EVERY 50 ROUNDS, CHECK TO SEE IF BFA IS STILL TIGHT. WARNING BEWARE BFA RING COULD BE “HOT” •

•

• •

Thoroughly clean your weapon and Blank Firing Attachment (BFA) after each firing exercise. Blank ammunition builds up carbon faster than live ammunition. To ensure continued / proper weapon function, it is conceivable that thorough cleaning may be necessary after firing each 500 rounds. If necessary, clean weapon before firing blank rounds. Use of BFA “Rate of Fire” goes up approximately 100 rounds per minute.

2-49


2.14 ACCESSORY (cont) 2.14.4 BLANK FIRING BARREL (BFB)

•

•

•

Thoroughly clean your weapon and Blank Firing Barrel (BFB) after each firing exercise. Blank ammunition builds up carbon faster than live ammunition. To ensure continued / proper weapon function, it is conceivable that thorough cleaning may be necessary after firing each 500 rounds. If necessary, clean weapon before firing blank rounds.

2-50


2.14 ACCESSORY (cont) 2.14.5 SOUND SUPPRESSOR (SOPMOD) NOTE

THE RATE OF FIRE WILL INCREASE TO APPROXIMATELY 900 ROUNDS PER MINUTE. THE WEAPON AND SUPPRESSOR SHALL BE CLEANED AFTER EVERY 1000 ROUNDS. CAUTION DO NOT EXCEED SUSTAINED FIRING RATE OF 85 RDS/MIN WITH SUPPRESSOR ATTACHED. IF EXCEEDED, DAMAGE TO SUPPRESSOR WILL RESULT. THE SUPPRESSOR MUST BE COOLED TO AMBIENT TEMPERATURE AFTER EVERY 200 ROUNDS FIRED AT THE 85 RDS/MIN RATE.

Refer to Special Operations Peculiar Modifications Accessories Kit ST-23-31-1 and heed all WARNINGS, CAUTIONS, AND NOTES pertaining to the use and maintenance of Sound Suppressor. See Appendix B.

2-51


2.14 ACCESSORY (cont) 2.14.5 SOUND SUPPRESSOR (SOPMOD) (cont)

LATCH PLATE

LATCH PLATE

RETAINING RING RETAINING RING

UNLOCKED POSITION

LOCKED POSITION

2-52


Section III.

OPERATION UNDER UNUSUAL CONDITIONS

2.15 ENVIRONMENT/WEATHER (Protective Measures) NOTE SEE LUBRICATION GUIDE.

2-53


2.15 ENVIRONMENT/WEATHER (Protective Measures) (cont) WARNING WITH AMMUNITION AND WEAPON EXPOSED TO THE SUN ON A HOT SUNNY DAY COOK-OFF CAN OCCUR WITH 50 ROUNDS OF CONTINUOUS FIRING.

Do not remove linked ammunition from the 200 round container. Operation with free hanging linked ammunition will allow water, sand, dirt, mud, snow and ice to enter the weapon, causing feed problems. Be sure weapon covers, such as the link ejection port cover, are closed when weapon is not in operation. This will prevent sand, dirt, mud and snow from entering the weapon. Keep weapon covered when possible. This will prevent sand, dirt, snow and water from accumulating. CAUTION TO AVOID DAMAGE TO EQUIPMENT, DO NOT USE DRY CLEANING SOLVENT ON PLASTIC COMPONENTS, SEALED BUFFERS, ETC..

During unusual conditions, it may be necessary to periodically flush out sand, mud and other debris from areas like the trigger assembly that you are not authorized to disassemble.

2-54


2.15 ENVIRONMENTAL/WEATHER (Protective Measures) (cont) 2.15.1 EXPOSURE TO WATER-MUD WARNING ENSURE BARREL IS NOT OBSTRUCTED BY WATER OR MUD. 

Disassemble, clean, lightly lubricate and assemble as soon as possible.



Make sure it is dry before lubricating.



Generously lubricate external surface.

2.15.2 HOT-WET/SALT AIR 

Inspect more frequently for signs of rust.



Keep gun as moisture-free as possible.



Clear and lubricate as necessary to preserve the metal and prevent rust.



Use a generous second coat of lubrication on external surfaces for extra protection.

2-55


2.15 ENVIRONMENTAL/WEATHER (Protective Measures) (cont) 2.15.3 HOT - DRY - SAND - DUST NOTE DO NOT LUBRICATE THE EXTERIOR METAL SURFACES, AS THIS WILL ONLY COLLECT DUST AND SAND. 

Clean in enclosed areas when possible, away from blowing sand and dust.



Clean and lubricate only moving parts.



Extreme heat dries up lubricant. Clean and lubricate more frequently.

2.15.4 COLD - ICE – SNOW 

If possible, thoroughly clean, dry and lubricate the weapon in a warm dry place.



If weapon is brought indoors, keep it away from direct heat.



Exercise weapon and lubricate daily to help prevent corrosion



If metal "sweats" dry and lubricate parts before taking weapon outdoors. Apply a light second coat of lubrication to provide protection.

2-56


CHAPTER 3 MAINTENANCE INSTRUCTIONS Section I. LUBRICATION INSTRUCTIONS 3.1 LUBRICATION GUIDE

Cleaner, Lubricant, and Preservative (CLP) is the only lubricant to use on your weapon. Remember to remove excessive lubricant from the bore before firing. CLP - Grade 2 is used for all temperatures. Lightly Lubricate - a film of oil barely visible to the eye. Generously Lubricate - Heavy enough so that it can be spread with finger.

3-1


3.1 LUBRICATION GUIDE (cont) NOTE LP WILL PROVIDE REQUIRED LUBRICATION AT TEMPERATURES BETWEEN °F AND -35°F (-19°C AND - 37°C). OWEVER, IF 1/2 OZ. BOTTLE IS STOWED WHERE TEMPERATURES REACH °F (-19°C) OR LOWER, BOTTLE BECOMES RIGID AND HARD TO DISPENSE CLP.

Disassemble, clean, lubricate, and reassemble as required.

3-2


Section II. TROUBLESHOOTING PROCEDURES 3.2 TROUBLESHOOTING a.

The table lists the common malfunctions which may occur during the operation or maintenance of the weapon or its components. Perform the tests/inspections and corrective actions in the order listed.

b.

This manual cannot list all malfunctions that may occur, nor all tests or inspections and corrective actions. If a malfunction is not listed or is not corrected by listed corrective actions, forward to unit armorer for corrective action.

3-3


3.2 TROUBLESHOOTING (cont) TROUBLESHOOTING TABLE MALFUNCTION 1. Sluggish Operation

TEST OR INSPECTION Dirty receiver Lack of lubricants Carbon buildup in gas system

2. Failure to feed

Insufficient lubrication Defective ammunition links Obstruction in receiver Insufficient gas pressure Unlatched cover

3-4

CORRECTIVE ACTION Clean and lubricate Lubricate Clean gas block, piston and gas cylinder Lubricate as required Remove defective ammunition, install new ammunition Remove obstruction Clean gas block, piston and gas cylinder Latch cover


3.2 TROUBLESHOOTING (cont) MALFUNCTION 2. Failure to feed (cont.)

3. Double feed

TEST OR INSPECTION Long/short rounds Inverted link belt Damaged, weak or worn operating parts Dirty ammunition or chamber Broken extractor/spring

CORRECTIVE ACTION Align rounds in link belt Reinstall link belt with open end of link facing down Forward to unit armorer for corrective action Clean ammunition and /or chamber Forward to unit armorer for corrective action

SPRING

(not shown)

EXTRACTOR

3-5


3.2 TROUBLESHOOTING (cont)

MALFUNCTION 4. Failure to chamber

TEST OR INSPECTION Dirty ammunition Carbon build up in gas system

Carbon build up in receiver Damaged round Damaged or weakened helical compression spring (driving)

HELICAL COMPRESSION SPRING (DRIVING)

3-6

CORRECTIVE ACTION Clean ammunition Clean gas block, piston and gas cylinder. If problem still exists, forward to unit armorer for corrective action Clean receiver Remove round and recharge weapon Forward to unit armorer for corrective action



MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

4. Failure to chamber (cont)

Dirty chamber Damaged gas block

Clean chamber Forward to unit armorer for corrective action

5. Failure to fire

Safety on

Push safety left (RED BAND visible)

SAFETY

RED BAND

3-7



MALFUNCTION 5. Failure to fire (cont)

TEST OR INSPECTION Link belt improperly loaded

CORRECTIVE ACTION Remove and install link belt properly.

LINKED BELT

Faulty Ammunition

3-8

Eject round, Replace ammunition.



MALFUNCTION 5. Failure to fire (cont)

TEST OR INSPECTION

CORRECTIVE ACTION

Broken or damaged firing pin


Broken or weakened helical compression spring (driving)


HELICAL COMPRESSION SPRING (DRIVING)

3-9


3.2 TROUBLESHOOTING (cont.)

MALFUNCTION 6. Failure to extract

TEST OR INSPECTION Inspect for stuck cartridge case

Follow instructions in Chapter 2, Section II of this manual.

Dirty chamber/bolt and slide assembly

Clean chamber and/or clean bolt and slide assembly. If problem still exists forward to unit armorer for corrective action.

Carbon build up in gas system

Clean gas block, piston and gas cylinder.

Damaged extractor/spring


EXTRACTOR SPRING

(not shown)

CORRECTIVE ACTION

3-10


3.2 TROUBLESHOOTING (cont) MALFUNCTION 7. Failure to eject

TEST OR INSPECTION

CORRECTIVE ACTION

Short recoil

Clean and lubricate bolt and slide assembly. If problem still exists forward to unit armorer for corrective action.

Damaged ejector/spring


Carbon build up in gas system

Clean gas block piston and gas cylinder.

EJECTOR

3-11


3.2 TROUBLESHOOTING (cont) MALFUNCTION 8. Stops firing

TEST OR INSPECTION

CORRECTIVE ACTION

Defective round in chamber.

Eject round.

Bolt and slide assembly not forward and locked

Remove obstruction or clean and lubricate as required.

LOCKED

UNLOCKED

Primer indented but not fired

3-12

Eject round. If this occurs more then once; Faulty ammunition or worn firing pin may cause it. Forward to unit armorer for corrective action.


3.2 TROUBLESHOOTING (cont) MALFUNCTION 8. Stops firing (cont)

TEST OR INSPECTION

CORRECTIVE ACTION

Sticking feed mechanism.

Clean and lubricate feed mechanism. If problem still exists forward to unit armorer for corrective action.

Carbon buildup in gas system

Clean gas block, piston and gas cylinder. If problem still exist, forward to unit armorer for corrective action.

Short recoil

Clean gas block, bolt and piston assembly. Lubricate bolt. If problem still exists forward to unit armorer for corrective action.

Bolt jammed in barrel socket


3-13


3.2 TROUBLESHOOTING (cont.)

MALFUNCTION 9. Failure to cock or runaway weapon.

TEST OR INSPECTION

CORRECTIVE ACTION

Broken, worn or burred sear.


Piston assembly sear notch worn


NOTCHES

3-14


3.2 TROUBLESHOOTING (cont) MALFUNCTION 9. Failure to cock or runaway weapon (cont).

10. Failure to Lock in open blot position

TEST OR INSPECTION

CORRECTIVE ACTION

Sear stuck in trigger housing


Short recoil.

Clean and lubricate bolt and slide assembly.

Carbon buildup in gas system.

Clean gas block, piston and gas assembly.

Safety fails to slide properly

Clean and lubricate safety and or replace.

3-15


SECTION III – MAINTENANCE PROCEDURES 3.3 FIELD STRIPPING (Disassembly)

3.3.1 Sling & Snap Hook Assembly: Removal: Squeeze the latch on snaphooks and remove hooks from buttstock, and forward area of receiver.

LATCH

LATCH

3-16


3.3 FIELD STRIP (Disassembly) (cont) 3.3.2 Cover, Feed Mechanism, Assembly: Squeeze cover latches inward, raise cover until it engages cover latch, to remain in open position.

3-17


3.3 FIELD STRIP (Disassembly) (cont) 3.3.3 Buttstock w/Hydraulic Buffer: WARNING ENSURE MOVING PART COMPONENTS ARE IN FORWARD POSITION, THIS MINIMIZES SPRING TENSION

Removal: Pull the upper retaining pin at rear of receiver to the left. Removal may be easier by depressing the locking spring tip on the right side of the receiver. The lower pin may be removed in a similar manner. Remove the buttstock assembly by pulling it rearward while supporting trigger mechanism once both pins have been disengaged. UPPER RETAINING PIN

LOWER PIN

3-18


3.3 FIELD STRIP (Disassembly) (cont) 3.3.4 Trigger Assembly: WARNING NEVER REMOVE TRIGGER MECHANISM BEFORE WEAPON IS CLEARED. REMOVAL OF THE TRIGGER MECHANISM FROM LOADED WEAPON WILL CAUSE A RUNAWAY. ENSURE MOVING PART COMPONENTS ARE IN FORWARD POSITION, THIS MINIMIZES SPRING TENSION

.

Removal: Pull trigger assembly down and rearward

3-19


3.3 FIELD STRIP (Disassembly) (cont) 3.3.5 Drive Spring & Return Rod Transfer Mechanism: WARNING ENSURE MOVING PART COMPONENTS ARE IN THE FORWARD POSITION, THIS MINIMIZES SPRING TENSION. Removal:

Push in and up on the return rod transfer mechanism and remove. Separate drive spring from return rod.

3-20


3.3 FIELD STRIP (Disassembly) (cont) 3.3.6 Moving Parts (Operating Rod, Slide Assembly & Bolt Assembly): Removal: Pull the cocking handle rearward. Slide the moving parts rearward and out of receiver. Rotate the bolt clockwise to disengage the lug and pull it out of the slide assembly. To separate slide assembly from the piston assembly, press the retaining pin to the left using cleaning rod section and lift off the slide assembly. Return cocking handle to forward position.

3-21


3.3 FIELD STRIP (Disassembly) (cont) 3.3.7 Barrel Assembly: Removal: Depress barrel locking level with left hand and lift the barrel out by the carrying handle.

Carrying Handle BARREL LOCKING LEVER

3-22


3.3 FIELD STRIP (Disassembly) (cont) 3.3.8 Gas Cylinder Assembly: Removal: Grasp knurled end, turn left or right to release the locking spring and pull out

3-23


3.3 FIELD STRIP (Disassembly) (cont) 3.3.9 Bipod Assembly: Removal: Slide Bipod Assembly off the receiver boss.

3-24


3.4 CLEANING, INSPECTION AND REPAIR WARNING USING GASOLINE, KEROSENE, HYDRAULIC OIL, BENZENE, BENSOL HIGH-PRESSURE WATER, STEAM FOR CLEANING IS PROHIBITED.

CAUTION DO NOT USE ABRASIVES TO CLEAN THE BORE, PISTON, GAS CYLINDER OR GAS BLOCK.

NOTE DO NOT REMOVE EXTRACTOR COMPONENTS DURING CLEANING

3-25


3.4 CLEANING, INSPECTION AND REPAIR (cont)

1. Softpak Cleaning Kit (includes items specified on Appendix B). 2. Scraper Assembly. 3. Wrench, Spanner.

1

3

2

3-26



CAUTION DO NOT LUBRICATE GAS BLOCK ON BARREL. DO NOT USE ABRASIVES TO CLEAN GAS BLOCK, BORE AND CHAMBER.

BORE AND CHAMBER

GAS BLOCK REGULATOR

3-27


3.4 CLEANING, INSPECTION AND REPAIR (cont) CAUTION BE SURE TO CLEAN YOUR BARREL BORE FROM THE CHAMBER END WITH BARREL REMOVED FROM WEAPON.

1. Inspect bore and chamber. 2. Wipe outside of barrel with a lightly lubricated rag. 3. If heavy carbon deposits are present in the bore, chamber, gas block, and compensator, clean with bore brush/chamber brush and scraper assembly. 4. Inspect for cracks, dents, burrs or other damage on compensator, barrel extension, and barrel release lever. Check front sight for looseness, if loose forward to unit armorer for corrective action.

3-28


3.4 CLEANING, INSPECTION AND REPAIR (cont) NOTE USE CARE WHEN CLEANING THE COVER AND FEED MECHANISM TO AVOID KNOCKING THE SPRINGS OUT.

5. Check cover feed mechanism for smooth operation, spring tension, bent parts or excessive wear. CLP, COVER LATCHES

CLP COVER PIN

CLP, FEED LEVER

CLP, COCKING HANDLE

CLP - Lightly lubricate moving parts.

CLP, FEED PAWLS

3-29



6. Check for bends and cracks, free movement of cocking assembly and excessively worn, burred or chipped rails. Check barrel locking latch and cover detent springs for spring tension. Lightly lubricate all rails. Check ejector and ejector spring for free movement, lightly lubricate spring. CLP, COCKING HANDLE GUIDES

EJECTOR, CLP, RAILS

SPRING CLP

3-30



7. Check for broken pistol grip and chipped or cracked trigger housing holding lug. Forward to unit armorer for corrective action if problem exists. 8. Check tripping lever and sear for burrs, cracks, chips and wear. Forward to unit armorer for corrective action if problem exists. 9. Check cocking action by pushing back on tripping lever, sear will rise. Pull trigger, sear will lower. Push back on tripping lever. 10. Check safety function. When safety is pushed to right (RED BAND not visible), pull trigger, sear will not lower. When safety is pushed to left (RED BAND visible) pull trigger, sear will lower. 11. CLP - Lightly lubricate tripping lever and sear surfaces, ends of trigger pin, safety shaft and sear pivot pin. TRIPPING LEVER CLP

SEAR CLP

HOLDING LUGS CLP TRIGGER SAFETY CLP

PISTOL GRIP

3-31



12. Check slide assembly, bolt assembly, piston assembly, and return rod and transfer mechanism assembly for burrs, cracks or broken pins. Push down on roller of slide assembly to make sure it will retract. Check driving spring for broken strands. Forward to unit armorer for corrective action if more than one broken strand is found on same coil or if more than two strands are broken regardless of location on entire spring. 13. CLP – Lightly lubricate driving spring, return rod and transfer mechanism assembly, bolt assembly, piston assembly, slide assembly, moving parts, polished areas, firing pin and roller. CAUTION DO NOT LUBRICATE PISTON OR BOLT FACE BOLT FACE NO CLP

BOLT CLP

FIRING PIN CLP

ROLLER CLP SLIDE ASSEMBLY CLP

PISTON NO CLP

OPERATING ROD ASSEMBLY CLP DRIVING SPRING CLP TRANSFER MECHANISM CLP

3-32



14. Clean and check Bipod Assembly, for operation; CLP - lightly lubricate. Forward Forwa rd to unit armorer for corrective action if problem exists.

3-33



15. Clean and check the rear sight assembly for windage and elevation; CLP - lightly lubricate. If rear sight does not function properly, forward to unit armorer for corrective action. CLP

WINDAGE

ELEVATION

CLP

3-34


3.4 CLEANING, INSPECTION AND REPAIR (cont) CAUTION DO NOT LUBRICATE CHROME AREA AR EA OF GAS BLOCK

16. Gas Block: Clean the front of gas block on barrel by inserting tip of scraper into inside diameter and rotate handle. Move forward until blade engages gas gas block groove, rotate back and forth. Remove Scraper from inside diameter and with tip inserted into grooves, rotate back and forth under barrel diameter. (10 to 2 o’clock position) until grooves are clean.

TIP

TIP

3-35



17. Gas Cylinder: Clean the inner most internal groove of the gas cylinder by inserting and rotating the flat side of the scraper in the hole.

3-36


3.4 CLEANING, INSPECTION AND REPAIR (cont) CAUTION DO NOT LUBRICATE INTERIOR OF GAS CYLINDER

17. Gas Cylinder (cont): Clean the outer most internal groove of the gas cylinder by inserting and rotating the flat side of the scraper in the hole. Lightly lubricate exterior of gas cylinder only.

3-37



18. Piston: The grooves of the piston will be cleaned as shown . Squeeze and rotate.

(Typical cleaning of one of three grooves.)

3-38


3.4 CLEANING, INSPECTION AND REPAIR (cont) CAUTION DO NOT LUBRICATE INTERIOR OR EXTERIOR PISTON.

18. Piston (cont): Clean the hole on the front of piston with the scraper as shown below. Lightly lubricate piston rod, but not the piston. PISTON

3-39


3.4 CLEANING, INSPECTION AND REPAIR (cont) 19. Rail Adapter: Remove; 11 - Rib, Rail, Cover.

Inspect for loose or missing screws, 3 each side. Replace or tighten as required with 1/8 hex Allen wrench.

SCREWS

3-40



3-41


3.5 FIELD STRIP (Assembly) NOTE THE RECEIVER AND BIPOD LEGS SHOULD BE POSITIONED AS SHOWN BELOW

3.5.1 Bipod Assembly:

Place the bipod on the forward area of receiver.

3-42


3.5 FIELD STRIP (Assembly) (cont) 3.5.2 Gas Cylinder Assembly: With weapon in vertical position, push the gas cylinder through the bipod yoke into the receiver.

Push the cylinder to the rear while countering the pressure of the locking spring and guiding the end of the cylinder into receiver with the other hand applying downward pressure. Turn the cylinder until the spring click into the recess at the rear of the gas cylinder

3-43


3.5 FIELD STRIP (Assembly) (cont) 3.5.3 Barrel Assembly, Fluted: Lay barrel bushing of barrel on top of receiver and slide rearward (the carrying handle may be used for this purpose), while aligning gas block, depress barrel latch, install into receiver opening and release latch. Ensure barrel is positively latched.

3-44


3.5 FIELD STRIP (Assembly) (cont) 3.5.4 Moving Parts (Operating Rod, Slide Assembly & Bolt Assembly):

Assemble the slide assembly to the piston assembly, and secure by pushing retaining pin from left to right.

RETAINING PIN

3-45


3.5 FIELD STRIP (Assembly) (cont) 3.5.4 Moving Parts (Operating Rod, Slide Assembly & Bolt Assembly) (cont): NOTE BE SURE FIRING PIN SPRING IS ON FIRING PIN

Put the bolt assembly into the slide assembly. Press in to compress the firing pin spring, rotate the bolt and hook its driving lug into the slide assembly.

3-46


3.5 FIELD STRIP (Assembly) (cont) WARNING ENSURE CHARGING HANDLE IS ALL THE WAY FORWARD CAUTION ENSURE BOLT LUGS AND SLIDE CUTOUTS ARE PROPERLY ALIGNED ON RECEIVER GUIDES

3.5.4 Moving Parts (Operating Rod, Slide Assembly & Bolt Assembly) (cont):

Put the moving parts into the receiver receiver with the feed cover open. Locate the bolt lugs and slide cutouts carefully on the rails. At the same time locate the piston into the rear of the gas cylinder.

3-47


3.5 FIELD STRIP (Assembly) (cont) 3.5.5 Drive Spring & Return Rod Transfer Mechanism: CAUTION IMPROPER ASSEMBLY OF THE TRANSFER MECHANISM CAN CAUSE DAMAGE TO THE RECEIVER AND/OR THE ASSEMBLY ITSELF. IF THE HORIZONTAL PINS OF THE TRANSFER ASSEMBLY ARE NOT PLACED ON THE HOOKS, INSIDE THE RECEIVER, WHEN THE BUTTSTOCK IS PIVOTED IN THE UP POSITION FOR PINNING, THE RECEIVER HOOKS CAN BEND. IF THE HORIZONTAL PINS OF THE TRANSFER ASSEMBLY ARE ROTATED TO A VERTICAL POSITION AND THE BOTTOM PIN IS HOOKED INTO THE LIGHTENING HOLE IN THE BOTTOM OF THE RECEIVER, THE PIN CAN BE SHEARED, DAMAGED OR LOST WHEN THE WEAPON IS FIRED.

3-48


3.5 FIELD STRIP (Assembly) (cont) 3.5.5 Drive Spring & Return Rod Transfer Mechanism (cont): NOTE ENSURE THAT THE HEADED END OF VERTICAL PIN, IN THE TRANSFER MECHANISM ASSEMBLY, IS UP (on top)

While rotating in either direction, slide spring on return rod and transfer mechanism assembly: HEADED PIN

Push the return rod and transfer mechanism assembly into its housing in the rear of the piston. Press in and down on the rear of the assembly until its two protruding pins are positioned in the receiver grooves PROTRUDING PINS (BOTH SIDES)

3-49


3.5 FIELD STRIP (Assembly) (cont) 3.5.6 Trigger Assembly: NOTE ENSURE RETAINING PIN IS TO THE LEFT

Install trigger assembly mechanism onto support and receiver, rotate upward and hold in place (rear mounting hole).

3-50


3.5 FIELD STRIP (Assembly) (cont) 3.5.7 Buttstock Assembly w/Hydraulic Buffer: WARNING WHEN THE LOWER PIN (PIVOT) RETENTION IS NOT POSITIVELY RETAINED IT CAN WORK LOOSE DURING FIRING. IF IT WORKS COMPLETELY OUT, THE TRIGGER MECHANISM CAN SEPARATE FROM WEAPON. SEPARATION OF THE TRIGGER MECHANISM WHEN THE WEAPON IS LOADED, WILL CREATE A RUNAWAY WEAPON.

Push lower pivot pin through one side of trigger frame. Insert buttstock assembly and push lower pivot pin completely to the right. Rotate buttstock assembly upward and push upper retaining pin to right to secure. If positive retention does not exist with both grooves of the lower pivot pin and upper retaining pin forward to unit armorer for corrective action.

3-51


3.5 FIELD STRIP (Assembly) (cont) 3.5.7 Buttstock Assembly w/Hydraulic Buffer (cont):

LOWER RETAINING PIN

UPPER RETAINING PIN

3-52


3.5 FIELD STRIP (Assembly) (cont) 3.5.8 Cover, Feed Mechanism Assembly: Depress barrel locking lever. Pull cover downward and lightly slam cover latch into receiver. Ensure proper latching.

BARREL LOCKING LEVER

3-53


3.5 FIELD STRIP (Assembly) (cont) 3.5.9 Sling & Snap Hook Assembly: Squeeze the latch on the snap hook and install hook in loop of buttstock assembly and in opening at forward end of receiver.

LATCH

LATCH

3-54


3.6 FUNCTION CHECK •

• •

• •

•

•

•

•

Assure the safety is to the left (RED BAND visible) and charge the weapon by pulling the cocking handle to the rear to lock the bolt (cock the weapon). Push cocking handle forward until you hear it click. Push safety to the right (RED BAND not visible). Open cover assembly and place link belt of several rounds of M199 dummy ammunition on feed tray with first round against cartridge stop. Pull the trigger nothing should happen. Push safety to the left (RED BAND visible) and pull the trigger. The bolt assembly should move forward, stripping, feeding and locking a dummy round (M199) in the chamber. Pull cocking handle to rear. Dummy round (M199) should extract and eject and the bolt assembly should remain to rear. Repeat the cycle several times. Each time the cycle is repeated, a link should exit the cover assembly. With bolt assembly held to the rear, check for clear weapon. Hold cocking handle to rear, pull the trigger and ride the bolt assembly forward to close and lock on empty chamber. If for any reason the weapon fails the function test, check for missing or improperly assembled components. If the reason for failure cannot be detected forward to unit armorer for corrective action.

3-55


THIS PAGE IS INTENTIONALLY LEFT BLANK

3-56


CHAPTER 4 MAINTENANCE OF AUXILARY EQUIPMENT Section I.

AUXILARY EQUIPMENT

4.1 BLANK FIRING ATTACHMENT (BFA)

Clean frequently using CLP. If BFA becomes cracked or distorted, replace. 4.2 STOCK ASSEMBLY, COLLAPSIBLE (Accessory)

If collapsible buttstock is damaged or does not function correctly, forward to unit armorer for corrective action for repair. 4.3 MAGAZINE, CARTRIDGE (100 Rd)

Inspect magazine for missing parts, broken zipper; torn cloth; Deformed feed lips; cracked top; deformed, cracked or broken dovetail; and bent or loosen spring catch. If magazine does not function properly or cannot be retained in weapon dovetail, forward to unit armorer for corrective action.

4-1


4.4 ACCESSORY KIT COMPONENTS (SOPMOD) SOPMOD items identified for authorized use with MK46 MOD 1 Machine Gun, for maintenance refer to Special Operations Peculiar Modifications Accessories Kit ST 23-31-1.

As applicable; (See Appendix B) SCOPE, DAY, OPTICAL • HANDGRIP FORWARD • SIGHT, REFLEX • AN/PEQ-2 (ITPIAL) SYSTEM • AN/PEQ-5 VISIBLE LASER POINTER • MINI NIGHT VISION SIGHT (AN/PVS-17A) • SOUND SUPPRESSOR • 11 - RIB RAIL COVERS • NOTE ALL WARNINGS, CAUTIONS, NOTES IN KIT ST 23-31-1 ARE APPLICABLE TO USAGE WITH MK46 MOD 1

4-2


CHAPTER 5 AMMUNITION WARNING DO NOT FIRE: Seriously corroded ammunition Dented cartridges Cartridges with loose bullets Cartridges exposed to extreme heat (direct sunlight on a hot day) until they have cooled Cartridges with pushed in (short) bullets

CAUTION IF AMMUNITION IS WET OR DIRTY, WIPE IT OFF WITH A DRY RAG PRIOR TO USE. DUST AND OTHER ABRASIVES THAT COLLECT ON OILY AMMUNITION ARE DAMAGING TO OPERATING PARTS OF THE WEAPON. DO NOT LUBRICATE. LUBRICATED CARTRIDGES PRODUCE EXCESSIVE CHAMBER PRESSURE.

5-1


Use only authorized ammunition that is manufactured to U.S. specifications

KEEP DRY, CLEAN, AND FREE OF “CRUD”. YOUR LIFE DEPENDS ON IT! WARNING BLANK AMMUNITION SHOULD NOT BE FIRED TOWARD PERSONNEL WITHIN 20 FEET OR LESS FROM THE MUZZLE, BECAUSE FRAGMENTS OF A CLOSURE WAD OR PARTICLES OF UNBURNED PROPELLANT MIGHT INFLICT INJURY WITHIN THAT RANGE. DO NOT LUBRICATE AMMUNITION UNDER ANY CIRCUMSTANCES! ALL PERSONNEL WITHIN 20 FEET OF A WEAPON FIRING SHALL WEAR APPROVED SINGLE HEARING DEVICES DURING TRAINING EXERCISES!

5-2


APPENDIX A BASIC ISSUE ITEMS LIST Section I. INTRODUCTION SCOPE This appendix lists the basic issue (BII) for the MK46 MOD1 Machine Gun to help you inventory items required for safe and effective operation.

GENERAL The BII lists is described as follows:

A-1


GENERAL (cont.) BII These are the minimum essential items required to place the MK46 MOD1 Machine Gun in operation, to operate it and to perform emergency repairs. Although shipped separately packaged, BII must be with the MK46 MOD1 Machine Gun during operation and whenever it is transferred between property accounts. The illustrations will assist you in identifying the items. This manual is your authority to request/requisition replacement BII, based on TOA authorization of the end item.

The following provides an explanation of columns found in the tabular listing: Column (1) - Illustration Number (Illus. No.) . This column indicates the number of the illustration in which the item is shown. Column (2) - National Stock Number. Indicates the national stock number (NSN) assigned to the item and will be used for requisitioning purposes.

A-2


GENERAL (cont.) Column (3) - Description CAGEC and Part No . Indicates the Federal item name and, if required a minimum description to identify and locate the item. The last line for each item indicates the Commercial and Government Entity Code (CAGEC) followed by the part number. Column (4) - Unit of Issue (U/I). Indicates how the item is issued for the NSN shown in column two. Column (5) - Quantity required (Qty Req) . Indicates the quantity of the item authorized to be used with/on the equipment

A-3


SECTION II. 5

BASIC ISSUE ITEMS 5

7

5

6

4

1

3 1A

6

1B

5 2

A-4

8


SECTION II.

BASIC ISSUE ITEMS

(1) ILLUS. NUMBER

(2) NATIONAL STOCK

(3) DESCRIPTION, CAGEC & PART NO.

(4) U/I

(5) QTY REQ.

1

1005-01-448-8513

EA

1

1A

5110-01-485-1405

EA

1

1B

5120-01-141-3839

EA

1

2

NONE

EA

1

3

1005-01-485-1409

EA

*

4

1005-21-912-8997

SOFTPAK CLEANING KIT (01VS3) 223M16 INCLUDES: SCRAPER ASSEMBLY (3S679) 46055 WRENCH, SPANNER (19200) 9350033 MANUAL OPERATORS (3S679) SW-360-AG-MMO-012 FRONT SIGHT ADJUSTING TOOL (3S679) 46070 BLANK FIRING ATTACHMENT (BFA) (19200) 12598135

EA

1

* one (1) for every four (4) weapons

A-5


(1) ILLUS. NUMBER 5

SECTION II. (2) NATIONAL STOCK NONE

5340-01-158-0134 1005-00-312-7177 6

NONE

7

1005-00-791-5420

8

NONE

BASIC ITEMS OF ISSUE (3) DESCRIPTION, CAGEC & PART NO. SLING & SNAP HOOK ASSY. (19200) 9348467 COMPOSED OF: SNAP HOOKS (19200) 9348468 SLING PADDED ADJUSTABLE (19200) 12002983 BARREL ASSEMBLY (SPARE) (3S679) 46121 CARRYING CASE, BARREL (19200) 7791009 EXTENSION, STRAP (3S679) 49244

A-6

(4) U/I

(5) QTY REQ.

EA

1

EA

1

EA

1

EA

1

EA

1


APPENDIX B ADDITIONAL AUTHORIZATION LIST SECTION I. INTRODUCTION SCOPE. This appendix lists additional items you are authorized for the support of the MK46 MOD1 Machine Gun.

GENERAL. This list identifies items that do not have to accompany the MK46 MOD1 Machine Gun and that do not have to be turned in with it. These items are all authorized to you by TOA.

EXPLANATION OF LISTING National stock numbers, descriptions and quantities are provided to help you identify and request the additional items you require to support this equipment. The items are listed in alphabetical sequence by item name under the type document (i.e., TOA which authorizes the item(s) to you.)

B-1


EXPLANATION OF COLUMNS. Column (1) - National Stock Number . Indicates the national stock number (NSN) assigned to the item and will be used for requisitioning purposes.

Column (2) - Description CAGEC and Part Number . Indicates the Federal item name and if required, a minimum description to identify and locate the item. The last line for each item indicates the Commercial and Government Entity Code (CAGEC), in parenthesis, followed by the part number.

Column (3) - Unit of issue (U/I). Indicates how the item is issued for the NSN shown in column one.

Column (4) - Quantity Required (Qty Req). Indicates the quantity of the item authorized to be used with/on equipment.

B-2


SECTION II (1) NATIONAL STOCK NONE 1005-01-334-1507

NONE NONE NONE NONE NONE

ADDITIONAL AUTHORIZED LIST (2) (3) DESCRIPTION, CAGEC & U/I PART NO. SCRAPER ASSEMBLY (3S679) 46055 MAGAZINE, CARTRIDGE (100 RD) (19200) 12944203 STOCK ASSEMBLY, COLLAPSIBLE (3S679) 46060 BLANK FIRING BARREL (BFB) (N00164) 1005-LL-L99-7749 ASSAULT PACK, 100 RND 5.56MM (SEMI RIGID) (3S679) PN 46098 LOAD BEARING EQUIPMENT POUCH (3S679) PN 46130 STRAP, FEEDER MK46 5.56MM NATO (3S679) PN 46097

B-3

(4) QTY REQ.

EA

1

EA

2

EA

1

EA

1

EA

6

EA

6

EA

20


SECTION II (1) NATIONAL STOCK 1005-01-448-8513

1005-01-449-9683 1005-01-449-9257 1005-01-449-8934 1005-01-445-6003 1005-01-445-6799 1010-01-445-6797

ADDITIONAL AUTHORIZED LIST (cont.) (2) DESCRIPTION, CAGEC & PART NO. SOFTPAK CLEANING KIT (01VS3) 223M16 CONSISTS OF: CASE, SOFTPAK (01VS3) 911-7 PATCHES (01VS3) 921 ROD, CLEANING 30” (01VS3) C-30-5 ROD, CLEANING 8” (01VS3) C-6 BRUSH, SHORT (01VS3) 324K SCRAPER (01VS3) 206K

B-4

(3) U/I

(4) QTY REQ.

EA

1

EA

1

EA

10

EA

1

EA

1

EA

1

EA

1


SECTION II (1) NATIONAL STOCK 1005-01-449-8928 1005-01-449-8902 1005-01-449-9315 1005-01-449-9672 1005-01-449-9943 1005-01-445-6798 NONE

1005-01-445-5889

ADDITIONAL AUTHORIZED LIST (cont.) (2) (3) (4) DESCRIPTION, CAGEC & PART U/I QTY REQ. NO. BRUSH (01VS3) 318-5 HANDLE “T” (01VS3) 01-5 TIP, SLOTTED BRASS (01VS3) 202-5 REMOVER, OBSTRUCTION (01VS3) 104-5 PICK (01VS3) 100-39-5 BRUSH, LENS (01VS3) 3762 LENS CLEANING SOLUTION & CLOTH (01VS3) 240-4 HANDLE, ROD (01VS3) 9098

B-5

EA

1

EA

1

EA

1

EA

1

EA

1

EA

1

EA

1

EA

1


SECTION II (1) NATIONAL STOCK

ADDITIONAL AUTHORIZED LIST (cont.) (SOPMOD) (2) (3) DESCRIPTION, CAGEC & U/I PART NO.

(4) QTY REQ.

1240-01-412-6608

SCOPE, DAY, OPTICAL (0FL29) MODEL TA01M4A1

EA

1

1005-01-416-1091

HANDGRIP, FORWARD (1S002) 95122 SIGHT, REFLEX (0FL29) RX01M4A1 AN/PEQ-2 (ITPIAL) SYSTEM (0B107) ITP-001 AN/PEQ-5 VISIBLE LASER POINTER (0B107) CVL-001 MINI NIGHT VISION SIGHT AN/PVS-17A (55311) 242970-004 SOUND SUPPRESSOR (1S002) 96062

EA

1

EA

1

EA

1

EA

1

EA

1

EA

1

1240-01-435-1916 5855-01-422-5253 5860-01-439-5409

5855-01-474-8904

1005-01-437-0324

B-6


SECTION II (1) NATIONAL STOCK 1005-01-453-4228 1005-01-453-4223 1005-01-453-4221 1005-01-453-4222 1005-01-453-5383 1005-01-453-5386

ADDITIONAL AUTHORIZED LIST (cont.) (SOPMOD) (2) (3) (4) DESCRIPTION, CAGEC & U/I QTY PART NO. REQ. 2 RIB RAIL COVER (19200) 12973138 4 RIB RAIL COVER (19200) 12973137 5 RIB RAIL COVER (19200) 12973136 6 RIB RAIL COVER (19200) 12973135 9 RIB RAIL COVER (19200) 12973134

EA

1

EA

1

EA

1

EA

1

EA

1

11 RIB RAIL COVER (19200) 12973132

EA

1

B-7


THIS PAGE IS INTENTIONALLY LEFT BLANK

B-8


APPENDIX C EXPENDABLE/DURABLE SUPPLIES AND MATERIALS LIST SECTION I. INTRODUCTION SCOPE. This appendix lists expendable/durable supplies and materials you will need to operate and maintain the MK46 MOD1 Machine Gun. These items are authorized to you by TOA. EXPLANATION OF COLUMNS. Column (1) - Level. This column identifies the lowest level of maintenance that requires the listed items (e.g., "C- OPERATOR/CREW").

C-1


EXPLANATION OF COLUMNS (cont.) Column (2) - National Stock Number. This is the National stock number assigned to the item; use it to request or requisition the item. Column (3) - Description CAGEC & Part Number . Indicates the Federal item name and if required, a description to identify the item. The last line for each item indicates the Commercial and Government Entity Code (CAGEC), in parenthesis, followed by the part number. Column (4) - Unit of Measure (U/M). Indicates the measure used in performing the actual maintenance function. If the unit of measure differs from the unit of issue, requisition the lowest unit of issue that will satisfy your requirements.

C-2


SECTION II. EXPENDABLE/DURABLE SUPPLIES AND MATERIALS LIST (1) LEVEL

(2) NATIONAL STOCK NO.

(3) DESCRIPTION CAGEC & PART NO.

C

9150-01-102-1473

CLEANER, LUBRICANT AND PRESERVATIVE (CLP) (81349) MIL-L-63460 1/2 OZ BTL

EA

C

9150-01-079-6124

CLEANER, LUBRICANT AND PRESERVATIVE (CLP) (81349) MIL-L-63460 4 OZ BTL

EA

C

9920-00-292-9946

CLEANER, TOBACCO PIPE (89855) DILLSPIPECLEANER

C-3

(4) U/M

EA


SECTION II. EXPENDABLE/DURABLE SUPPLIES AND MATERIALS LIST (cont.)

(1) LEVEL

(2) NATIONAL STOCK NO.

C

7920-00-205-1711

C

1005-00-912-4248

(3) DESCRIPTION CAGEC & PART NO. RAG, WIPING; COTTON (58536) A-A-531 50 lb. bdl. SWAB, SMALL ARMS CLEANING; COTTON (19204) 11686408

C-4

(4) U/M EA

EA

Sw360-Ag-mmo-012 5.56mm Lightweight Machine Gun,Mk46 Mod 1 Feb. 2006

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