MK14 Operators Manual

SW370-A2-OPI-010 SOFWEP-04-G10-0003-83-00 OPERATOR’S MANUAL for RIFLE, 7.62MM MK 14 MOD 0, Enhanced Battle Rifle (EBR)

Distribution Statement D: Distribution authorized to the DoD and DoD contractors only; due to Specific Authority (Public Law 90-629-ARMS EXPORT CONTROL ACT AND DoD 5230.25 WITHHOLDING OF); 1 October 2002. Other requests shall be referred to Commander, Code 4081 NSWC, 300 Highway 361, Crane, Indiana 47522-5001. Destruction Notice: Destroy by any method that will prevent disclosure of contents or reconstruction of this document.

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. Never open the weapon’s action if the barrel is extremely hot and you suspect there is a live round in chamber. 5. Always look into chamber to ensure it is empty after clearing weapon. 6. When ammunition and weapon are exposed to the sun on a hot sunny day, a cook-off can occur within 150 rounds of continuous firing. i

7. Do not allow cartridge primer to hit any hard surface or it may fire. Dispose of live rounds appropriately. 8. Ensure that the action is closed before beginning disassembly. 9. All personnel shall wear approved single hearing protection devices during training exercises. 10. Ensure there are no obstructions in the barrel. Cautions Do not interchange bolt, gas cylinder, and trigger group with other weapons.

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SW370-A2 -OPI-010 SOFWEP-04-G10-0003-83-00

Operator’s Manual for RIFLE, 7.62MM MK 14 MOD 0, Enhanced Battle Rifle (EBR) Distribution Statement D: Distribution authorized to DoD and DoD contractors only; due to specific Authority (PUBLIC LAW 90-629-ARMS EXPORT CONTROL ACT AND DoD 5230.25 WITHHOLDING OF) 1 October 2002. Other requests shall be referred to Commander, Code 4081 NAVSURFWARCENDIV, 300 Highway 361, Crane, Indiana 47522-5001. Destruction Notice: Destroy by any method that will prevent disclosure of contents or reconstruction of this document.

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Table of Contents WARNINGS ..................................................................................... i CAUTIONS ..................................................................................... ii CHAPTER 1 Section I 1-1 1-2 1-3 Section II 1-4 1-5 1-6

INTRODUCTION .......................................1-1 General Information ........................................... 1-1 Scope................................................................. 1-2 Corrosion, Prevention, and Control (CPC) ........ 1-3 Reporting Equipment Improvement Recommendations (EIR) ................................ 1-4 Equipment Description....................................... 1-5 Equipment Characteristics, Capabilities and Features............................... 1-5 Location and Description of Major Components 1-8 Equipment Data ............................................... 1-12

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CHAPTER 2 Section I 2-1 Section II 2-2 2-3

OPERATING INSTRUCTIONS.......................... 2-1 Preventive Maintenance Checks and Services (PMCS) ..................................... 2-1 PMCS Procedures ............................................. 2-1 Operation Under Usual Conditions .................... 2-9 Operation of the Weapon ................................... 2-9 Install Magazine ...............................................2-29

CHAPTER 3 Section I 3-1 3-2 Section II 3-3 3-4 3-5 Section III 3-6 3-7

MAINTENANCE INSTRUCTIONS .................... 3-1 Inspection and Lubrication ................................. 3-1 Inspection Guide ................................................ 3-1 Lubrication Guide ............................................... 3-2 Troubleshooting Procedures.............................. 3-6 Troubleshooting ................................................. 3-6 Disassembly Procedures (Field Stripping).......3-18 Cleaning, Inspection, and Repairs ...................3-34 Inspection Instructions .....................................3-38 Reassembly Procedures ..................................3-39 Scope Mounting (as required)..........................3-44 vi

3-8 3-9

Day Optic Sight Removal................................. 3-46 Function Check ................................................ 3-46

CHAPTER 4 4-1

MAINTENANCE OF AUXILIARY EQUIPMENT.............................. 4-1 Clean Bipod Assembly....................................... 4-1

CHAPTER 5 5-1

AMMUNITION.................................................... 5-1 Ammunition ........................................................ 5-1

APPENDIX A Section I A-1 A-2 A-3 Section II

BASIC ISSUE ITEMS (BII) LIST .......................A-1 Introduction ........................................................A-1 Scope.................................................................A-1 Basic Issue Items (BII) List ................................A-1 Explanation of Columns .....................................A-2 Basic Issue Items...............................................A-4

APPENDIX B Section I B-1

ADDITIONAL AUTHORIZED LIST ...................B-1 Introduction ........................................................B-1 Scope.................................................................B-1 vii

B-2 B-3 B-4 APPENDIX C Section I C-1 C-2 Section II

General ..............................................................B-1 Explanation of Listing .........................................B-1 Explanation of Columns .....................................B-2 EXPENDABLE/DURABLE SUPPLIES AND MATERIALS LIST ................................ C-1 Introduction ....................................................... C-1 Scope ................................................................ C-1 Explanation of Columns .................................... C-1 Expendable/Durable Supplies & Requirements List ............................................. C-3

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CHAPTER 1 INTRODUCTION Section I. General Information

1-1

Figure 1-1. Rifle, 7.62mm, MK14 MOD 0 Enhanced Battle Rifle (EBR).

1-1. SCOPE. a. Type of Manual: Operator’s Manual. b. Model number and equipment name: Rifle, 7.62mm, MK 14 MOD 0 Enhanced Battle Rifle (EBR). c. Purpose of Equipment: The purpose of the rifle is to provide personnel an offensive/defensive capability to engage enemy targets. 1-2

The adapter rails allow the operator the capability to mount various accessories on the MK 14 EBR. 1-2. CORROSION, PREVENTION, AND CONTROL (CPC). CPC of material is a continuing concern. It is important any corrosion issues be reported so that corrections/improvements can be made. 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 result of corrosion.

1-3

1-3. REPORTING EQUIPMENT IMPROVEMENT RECOMMENDATIONS (EIR). If your rifles or this manual need improvement, let us know. You, as the users, are the primary source of information on what needs improvement. Let us know what improvements in design or performance are needed. 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, Indiana 47522-5001 or use NSWC Code 4081 Form SMW-ECP and fill in blocks 1-6 and submit to [email protected] and copy [email protected]. 1-4

Section II. Equipment Description 1-4. EQUIPMENT CHARACTERISTICS, CAPABILITIES AND FEATURES. a. CHARACTERISTICS: The 7.62mm MK 14 MOD 0 Enhanced Battle Rifle (EBR) is a lightweight, air-cooled, gas operated, magazine fed weapon, used primarily for semi-automatic fire. b. CAPABILITIES: The MK 14 MOD 0 EBR will be used to engage target at ranges out to 600 yards for point targets and 1000 yards for area targets. The MK 14 MOD 0 EBR deliberately capitalizes on prior shooting and maintenance skills of individuals trained and proficient with M14 type rifles, and provides an inherently more versatile and precision arm. The EBR is equipped with multiple MIL-STD-1913 rails to facilitate the 1-5

mounting of various accessories for tailoring to operational requirements. c. FEATURES: The MK 14 MOD 0 Enhanced Battle Rifle consists of a rifle housed in a chassis stock system, vertical grip, improved iron sights, vortex flash suppressor, see-through scope rings, bipod with mount, tactical sling, maintenance kit and two magazines in a discreet soft case. MK 14 enhancements versus the M14 are a sage chassis stock system to include replacement operating rod guide and stripper guide, replacement rail, larger rear aperature, H&K style ring front sight on a replacement gas lock, and a vortex flash suppressor on a shorter 18 inch barrel (versus standard 22 inch unit). The Chassis Stock System of the EBR allows for compatibility with a number of currently fielded accessories to include many of those in the SOPMOD Kit for the M4A1 Carbine: Universal Pocket Scope Mount – on rear short rail (can hold AN/PVS-18, M68 AimPoint, 1-6

AN/PVS-14 depending on adapter), AN/PEQ-5, AN/PEQ-2 on any of the 4 front rails, Universal Night Sight or AN/PVS-22 (in front of a day optic on top rail), various rail mountable flashlights and bipods. Mounts have been prototyped to allow mounting of the AN/PVS-17 Series Mini Night Vision Sight (MNVS) as well (let your command know if there is interest). The Kydex fore-end heat shield has 1/8 inch holes to allow for zip ties etc. to be use to secure remote pressure switches as required. Any available 30mm Optics can be used with the see through rings provided (adapters would be required for 1” tube scopes).

1-7

1-5. LOCATION AND DESCRIPTION OF MAJOR COMPONENTS.

Figure 1-2. 7.62mm MK14 MOD 0 Enhanced Battle Rifle Major Components. 1-8

a. Bolt Assembly (1)

The bolt assembly feeds and locks the round in the chamber. The firing pin detonates the primer to fire the round. The spent cartridge case is removed from the chamber by the extractor.

b. Barrel/Receiver Group (2)

The barrel houses cartridges for firing and the receiver assembly serves as the support for all the major groups and assemblies of the weapon.

c. Operating Rod and Connector Group (3)

The operating rod and connector group drives the recoil parts of the weapon. This group consists of the recoiling parts of the weapon. It includes the operating rod, operating rod spring and guide, as well as the connector assembly.

1-9

d. Chassis Stock System (4)

The chassis stock system is comprised of a top cover with integral rail, and a grip/base assembly which houses a telescoping buttstock with adjustable cheek rest. The system includes MIL-STD-1913 rails for accessory mounting.

e. Firing Mechanism (5)

The firing mechanism houses the components required to provide locking, firing, and safety functions of the weapon.

f.

The magazine assembly consists of the magazine box, magazine spring, and magazine follower. The magazine capacity for the MK 14 EBR is 20 rounds of ammunition.

Magazine (6)

1-10

g. Vertical Grip (7)

The vertical grip attaches to the rail interface system and provides added support and control for firing and quicker handling with additional components attached to the weapon.

h. Fore-grip (8)

The fore-grip is secured to the bottom rail by 2 ¼-20 screws (and or the vertical grip). It provides a secure front gripping area and protects the user’s hand from heat during rapid fire.

1-11

1-6. EQUIPMENT DATA. Weights • MK14 EBR (Iron Sights/no magazine) • MK14 EBR (empty magazine, sling and vertical grip) • Magazine (empty) • Magazine (full) • Bipod w/mount • Sling • Vertical Grip Length • EBR with Stock collapsed • EBR with Stock fully extended Ballistics • M80 Ball muzzle velocity • M118LR muzzle velocity • Rate of Fire (auto) 1-12

11.0 lbs 12.4 lbs 0.52 lbs 1.6 lbs 0.74 lbs 0.57 lbs 0.3 lbs 34.9 inches 40.9 inches 2675 fps 2511 fps 750 rpm (approx)

CHAPTER 2 OPERATING INSTRUCTIONS Section I. PREVENTIVE MAINTENANCE CHECKS AND SERVICES (PMCS) 2-1. PMCS PROCEDURES. WARNING BEFORE STARTING AN INSPECTION, BE SURE TO CLEAR THE WEAPON. DO NOT KEEP LIVE AMMUNITION NEAR WORK AREA.

2-1

Table 2-1. Preventive Maintenance Checks and Services (PMCS). B=Before Operation, D=During Operation, A=After Operation Item 1

Interval Before

Before/ After

Before

Location Item to Check/Service Rifle, 7.62mm EBR

Procedure Visually check for missing or damaged components. a. Inspect for dents, cracks, burrs, fouling, foreign matter, looseness and defective components. b. Hand function operating rod and bolt assembly. They should not bind. 2-2

Not Fully Mission Capable If: All basic items of issue not present. Includes: 1. Manual, Operator’s 2. Magazine, (2 each) 3. Otis Cleaning Kit 4. Lubricant 5. Bore Snake

Table 2-1. Preventive Maintenance Checks and Services (PMCS) (Cont’d). B=Before Operation, D=During Operation, A=After Operation Item 1 (Cont’d)

Interval During

Location Item to Check/Service

Before/ After Before/ After

Before/ After 2-3

Procedure c. Check to see that moving parts function smoothly. d. Inspect for proper installation. e. Clean, wipe dry to remove oil, dirt and other foreign matter. f. Lubricate

Not Fully Mission Capable If: 6. Combination Tool. 7. MK 14 EBR folding tool. 8. Tactical Sling. 9. Bipod w/mount. 10. Discreet case.

Table 2-1. Preventive Maintenance Checks and Services (PMCS) (Cont’d). B=Before Operation, D=During Operation, A=After Operation Item 2

Interval Before

Location Item to Check/Service Bolt Group

Before

Before/ After 2-4

Procedure While charging weapon, confirm bolt group moves freely without binding. a. Remove and inspect for excessive wear cracks or breaks. b. Clean and lubricate.

Not Fully Mission Capable If: Bolt Group binds in the receiver.

Table 2-1. Preventive Maintenance Checks and Services (PMCS) (Cont’d). B=Before Operation, D=During Operation, A=After Operation Item 3

Interval Before/ After

Location Item to Check/Service Barrel & Receiver Group

Before/ After 4

Before/ After

Firing Mechanism

Procedure a. Inspect barrel bore and chamber for presence of carbon and foreign matter. b. Clean, wipe dry & lubricate. Hand function mechanism for proper operation per para 3-9 function check. 2-5

Not Fully Mission Capable If: An obstruction in barrel bore cannot be removed.

Firing mechanism does not function properly or binds. Safety engages with hammer forward.

Table 2-1. Preventive Maintenance Checks and Services (PMCS) (Cont’d). B=Before Operation, D=During Operation, A=After Operation Location Item to Check/Service

Item 4 (Cont’d)

Interval

5

Before/ After

Gas Cylinder

6

Before

Rear Sight

Procedure Safety will not engage when hammer is forward. Check gas cylinder plug for proper installation. Actuate windage knob and elevation pinion

2-6

Not Fully Mission Capable If:

Gas cylinder plug not properly installed or has missing gas cylinder plug. Rear sight windage knob and elevation pinion binds.

Table 2-1. Preventive Maintenance Checks and Services (PMCS) (Cont’d). B=Before Operation, D=During Operation, A=After Operation Item 6 (Cont’d)

Interval

7

Before/ After Before

Location Item to Check/Service

Magazine

Procedure assembly of rear sight. Make certain they do not bind. a. Inspect magazine for damage. b. Check to see if magazine inserts and locks in rifle properly. 2-7

Not Fully Mission Capable If:

If damage has occurred.

Table 2-1. Preventive Maintenance Checks and Services (PMCS) (Cont’d). B=Before Operation, D=During Operation, A=After Operation Item 8

Interval Before

Location Item to Check/Service Stock Assembly

Procedure Inspect for damage and for missing parts.

2-8

Not Fully Mission Capable If: Parts are missing from stock assembly.

Section II. OPERATION UNDER USUAL CONDITIONS 2-2. OPERATION OF THE WEAPON. a. Adjusting Cheekrest And Barrel Tension. (1) Cheekrest Adjustment (a) The height of the cheek rest may be adjusted by first rotating lock wrench up until it stops. Then, use a bullet tip to depress the plunger/detent to allow for movement of one-quarter inch increment at a time. The cheek rest has two inches of travel. The lock wrench is then closed against the side of the buttstock to secure the adjustment when finished.

2-9

Figure 2-1. MK 14 Mod 0 Cheek Rest Adjustment. (b) The buttpad can be removed to allow for repositioning of the wrench which secures the cheek rest adjustment by removing two hex head screws and pulling the buttpad and aluminum spacer plate to the rear and off of the stock system. The 2-10

lock wrench can now be repositioned by removing it to the rear off of the nut it turns, and then replace it in a position that secures the cheek rest firmly in position when closed, yet allows it to move freely when open.

Figure 2-2. Lock Lever Adjustment. 2-11

(c) The length of the stock is adjusted by depressing the lock lever using your thumb from under the cheek rest (with hand on rear grip). This unlocks the lock bar and allows for collapsing or extending the buttstock. When the desired position is reached, release the lever and push and pull on the stock to ensure the lockbar is fully engaged.

Figure 2-3. Stock Adjustment. 2-12

(d) At the very front of the top rail unit is a barrel tensioning screw which can be turned in to contact the barrel to the desired pressure and locked in position by either a lock nut underneath (on early models) or a set screw installed from the front or side. If any vertical stringing occurs when the rifle is very hot, this screw can be used to eliminate it. The holes in the top are threaded to 1/4-20 to allow for direct installation of the AN/PEQ-2 IR Laser pointer/illuminator using the low mount.

Figure 2-4. Barrel Tensioning Screw. 2-13

b. Loading. (1) Move the SAFETY to the safe position. (2) Insert a loaded magazine into the magazine well until the operating spring guide engages the magazine at the front. (3) Rotate rear of magazine up until the magazine latch snaps into position. A click will be heard to indicate that the magazine is fully seated. (4) If bolt is closed, pull back completely on the operating rod handle and release the handle to allow the bolt to strip, feed, and chamber the top cartridge from the magazine. Do not “ride” the handle forward or the round may not completely chamber. (5) If bolt is already open, pull back on the operating rod handle and release it or press the top of the bolt stop to release it chambering the top round. 2-14

Figure 2-5. Operating Rod Handle.

2-15

c.

Clearing.

WARNING To be considered SAFE before disassembly, cleaning, inspecting, transporting, or storing, the weapon must be cleared. (1) Make certain fingers are outside the trigger guard and the rifle is pointed in a safe direction. (2) Remove magazine. (3) Pull the operating rod handle all the way to the rear. (4) Inspect the receiver and chamber to ensure no cartridges are present. (5) Close bolt (don’t allow bolt to slam forward).

2-16

d. Battlesight Zero. (1) Zeroing Procedures. It is recommended to zero for a 300 yard POA/POI (Point of Aim/Point of Impact) as a battlefield or battlesight zero so that any targets within 400 yards will be hit by a center of mass aimed shot based on a 22 inch “kill” zone defined as +7 inches (above) to – 15 inches (below) with respect to the center of mass aiming point. A 300 yard zero would provide for a 350 yard battlefield zero based on a smaller 13-14 inch high “kill” zone. The bullet reaches its maximum height above line of sight at 150-175 yards at approximately 7 inches and drops to 6 inches below line of sight at 350 yards. A 100 yard zero can also be set. Sight adjustments would then be made for targets beyond 300 yards (where the bullet is already 16-18 inches below line of sight). If initial zeroing is to be done at a 25 yard range then the bullets should hit approximately 1 inch above line of sight (aimpoint) for a 300 yard zero or 0.5 inches below line of sight for a 100 yard zero. Any easily seen target can be used. A stable shooting position must be used for zeroing to assure that 3 round groups can be fired within about 2 MOA (1/2 inch ES at 25 yards). Iron sight zeroing is essentially the 2-17

same for M80 and M118LR as can be seen from the ballistic chart in Figure 2-6. MK14 MOD 0 Ballistic Info. 18 in. barrel/Standard Conditions M80 Ball muzzle vel. = 2675 fps M118LR muzzle vel. = 2511 fps Impact vs. Line of Sight (LOS) 300 yd M80 M118LR 100 yd M80 M118LR ZERO Path Path ZERO Path Path Yards Inches Inches Yards Inches Inches 0 -1.2 -1.2 0 -1.2 -1.2 25 0.9 1.1 25 -0.4 -0.4 50 2.8 3.1 50 0.1 0.1 75 0.2 0.3 75 4.3 4.7 100 0 0 100 5.9 5.4 125 6.2 6.7 125 -0.6 -0.7 150 6.7 7.1 150 -1.5 -1.8 175 6.7 7.1 175 -2.9 -3.3 200 200 6.6 -5.2 6.2 -4.6 225 5.4 5.7 225 -6.9 -7.7 250 4.1 4.3 250 -9.5 -10.6

Figure 2-6. Ballistics Chart (Sheet 1 of 2) 2-18

MK14 MOD 0 Ballistic Info. 18 in. barrel/Standard Conditions M80 Ball muzzle vel. = 2675 fps M118LR muzzle vel. = 2511 fps Impact vs. Line of Sight (LOS) 300 yd M80 M118LR 100 yd M80 M118LR ZERO Path Path ZERO Path Path Yards Inches Inches Yards Inches Inches 275 2.3 2.4 275 -12.7 -13.9 300 0 0 300 -16.3 -17.8 325 -2.7 -2.8 325 -20.4 -22.1 350 -6 --6.3 350 -25.1 -27 375 -10 -10.3 375 -30.4 -32.6 400 400 -15.1 -38.8 -14.7 -36.5 425 -20 -20.5 425 -43.2 -45.7 450 -26.1 -26.6 450 -50.6 -53.3 475 -33 -33.4 475 -58.9 -61.6 500 500 -41 -70.6 -40.6 -67.8

Figure 2-6. Ballistics Chart (Sheet 2 of 2). (2) Either of the two most stable firing positions, the foxhole or prone supported, may be used for obtaining the battlesight zero. 2-19

However, the position selected should be located on the prescribed 25-meter firing range. (3) Elevation Adjustment – Rear Sight Only – The sight elevation of the aperture is adjusted by the pinion. To raise the strike of the bullet, turn the pinion (left hand knob) clockwise. To lower the strike of the bullet turn the pinion counterclockwise (each click shifts impact 1.25 inches at 100 yards or 1 ¼ MOA). Pinion knob is actually marked in meters. (4) Front Sight Windage Adjustment – Front Sight-The front sight may be adjusted for major windage if desired to aid in centering of rear sight windage adjustment, but should not be adjusted so far as to overhang either side of the dovetail mount on the gas lock. A single Allen head screw secures the front sight in position (tighten firmly). The front sight moves in the opposite direction of bullet impact shift. (5) Windage Adjustment – Rear Sight – The lateral movement of the sight is regulated by the windage knob. Rotation of 2-20

the right hand rear sight knob counterclockwise shifts the impact left 1 ¼ inches at 100 yards for each click (1 ¼ MOA). Clockwise rotation moves impact right. NOTE If any play/tolerance can be felt in the front sight/gas cylinder assembly (movement on barrel) the assembly can be removed and the three spline grooves in the barrel can be peened slightly for a snug fit of the gas cylinder (it will then need to be tapped into place). A special gas cylinder wrench may be required to remove the gas lock if it is tight or a large adjustable wrench can also work. Do not interchange gas cylinders between weapons to assure the gas port remains properly aligned. The removal of any noticeable tolerance here could help slightly with iron sight accuracy. The flash suppressor must be removed in order to accomplish this, preferably with a ¾ inch open-end wrench (conventional right hand threads). The 3/16 inch hex key on the EBR folding tool may be used expediently to install or remove the flash suppressor if it is not excessively tight (slide through opposite slots at the rear, max. install torque=10 ft-lbs. 2-21

e. Immediate Action. If your weapon stops firing, perform the following immediate action: WARNING If a noticeable difference in sound or recoil is experienced, STOP FIRING. Either condition could indicate an incomplete powder burn and/or a bullet stuck in the bore. Retract operating rod handle slowly and remove fired cartridge case. Clean weapon and check for unburned powder grains in the receiver or bore and for a bullet in the bore before resuming firing. If the bullet is stuck in bore, return the weapon to the armorer. (1) Pull rearward on the magazine to make sure it is properly seated.

2-22

WARNING Do not load a rifle which could be hot enough to cause a cookoff (has fired over 180 rounds within 5 minutes). (2) Pull operating rod handle all the way back. Observe ejection of case or cartridge. Check chamber for obstruction. If chamber is not clear, perform remedial action. (3) If a cartridge or case is ejected and the chamber is clear, release the charging handle to feed a new round. Don’t ride the charging handle forward. (4) Now fire. If the weapon will not fire, look for trouble and apply remedial action. f.

Remedial Action.

2-23

WARNING If your weapon stops firing with a live round in the chamber of a hot barrel, remove the round quickly. However, if you cannot remove it within 10 seconds, remove magazine and wait 15 minutes with the weapon pointed in a safe direction. This way, you won’t get hurt by a possible round cooking off. Regardless, keep your face away from the ejection port while clearing a hot chamber. (1) If your weapon still fails to fire after performing immediate action, check again for jammed cartridge case. (2) If a cartridge case is in the chamber, tap it out with a cleaning rod. g. Bullet Stuck In Bore.

2-24

WARNING If an audible “POP” or reduce recoil is experienced during firing, immediately CEASE FIRE. DO NOT APPLY IMMEDIATE ACTION. (1) Remove the magazine. (2) Lock the bolt to the rear. (3) Place the selector lever on the “SAFE” position. (4) Visually inspect bore using a mirror or from the muzzle (assure magazine is removed). (5) If a bullet is stuck in the barrel of the weapon do not attempt to remove it. Turn the weapon into the armorer.

2-25

h. Loading Magazine. (1) Load magazine by placing a cartridge on the magazine between the feed lips and press the cartridge down into the magazine. Repeat until the magazine is full. (See figure 2-7).

Figure 2-7. Loading Magazine. 2-26

(2) Loading Magazine with Filler and Clip. NOTE The magazine may be loaded quickly using five-round stripper clips and the magazine filler found in each bandoleer. (a) With the magazine filler in place, place a five-round stripper clip in position. Using thumb pressure on the rear of the top cartridge, press down firmly until all ten rounds are below the feed lips of the magazine. (See Figure 2-8). (b) Remove the empty stripper clip while holding the magazine filler in place. (c) Repeat until 4 five-round clips are loaded. (d) Remove magazine filler and retain it for future use.

2-27

Figure 2-8. Loading Magazine with Filler and Clip. 2-28

2-3. INSTALL MAGAZINE. a. Insert magazine into the magazine well until the operating spring guide engages the magazine at the front. b. Rotate magazine back and up until the magazine snaps into position. A click will be heard to indicate that the magazine is fully seated.

Figure 2-9. Loading Magazine into Rifle. 2-29/(2-30 Blank)

CHAPTER 3 MAINTENANCE INSTRUCTIONS Section I. INSPECTION AND LUBRICATION 3-1. INSPECTION GUIDE. During and after cleaning the operator should inspect the rifle and its components for any irregularities that may cause problems during its operation. If any potential deficiencies are noted, they should be corrected immediately. • Damaged or missing parts • Improper assembly or function • Absence of free movement, where applicable • Uncustomary looseness • Parts exhibiting signs of cracks, burrs, dents or obvious signs of damage or stress • Presence of signs or tactile clicks in controls, where applicable 3-1

• • • •

General overall cleanliness Presence of proper lubrication Movement of gas piston (free movement) Presence of corrosion or degradation of surface finish

3-2. LUBRICATION GUIDE. a. General Lubrication Guidelines: (1) Use CLP (Cleaner Lubricant Preservative) which is a synthetic blend effective down to -65 degrees F and meets MIL-L63460 to clean and lubricate all metal parts requiring lubrication. Also use a light coating of it as a preservative on all exposed steel surfaces. (2) Every 1000 rounds apply a medium coating of rifle grease to the bolt locking lugs and their recesses in the receiver, the bolt guide track in the receiver, the operating rod guide track on the side of the receiver and press grease into the bolt roller and lightly coat the camming slot in the operating rod. 3-2

b. Extreme Conditions: (1) Hot: Minimize use of grease in a hot dusty / sandy environment to reduce dirt buildup from the environment. Replace grease with CLP in all areas but the bolt roller. In very extreme conditions the MK 14 MOD 0 can be fired reliably completely dry without any lubricants. Clean and re-lubricate as soon as conditions allow. (2) Cold: Again minimize use of grease in extreme cold environments. Use a light coating of CLP for lubrication of all areas but the bolt roller. (3) Saltwater: It is important to flush the entire weapon with plenty of fresh water after any submersion in Salt Water / Surf environments. Take the time to disassemble the rear sight if possible and flush with fresh water and re-grease contact areas. Also be sure bore has drained before attempting to fire if it has been submerged in water. Remove any muzzle cap used and retract bolt 1-2 inches to 3-3

allow for barrel drainage (dry the bore immediately if conditions permit). c.

General Cleaning Guidelines:

Cleaning Frequency (General Conditions- Extreme conditions will increase frequency) (1) Barrel - Chamber and Bore: Clean every 250 rounds with the supplied Otis Kit according to instructions provided in kit or use the supplied Bore Snake when little time is available - pull three times through bore with CLP on the first few inches of the bore snake (pull from chamber out muzzle). (2) Gas Cylinder / Piston - Remove and clean gas piston every 500 rounds and also clean gas cylinder bore at the same time (using Otis Kit). The M14 Combination Tool can be used to clean carbon from the piston grooves (it's 3/8 inch wrench section is also used to remove the gas plug). Be sure and clean any carbon build-up from the bore of the piston as well. Every 250 rounds check to be 3-4

sure the piston is free (falls under its own weight when the operating rod handle is retracted - muzzle up). Clean gas cylinder and piston any time piston is not free to move (dragging / binding). If the piston still drags even when clean turn the weapon in for inspection (gas cylinder lock may be overtorqued). Do not lubricate the piston or bore of the cylinder. (3) Bolt / Operating Rod /Connector Group - Clean these items every 1000 rounds. This requires removal of the action from the stock. See para 3-5 and disassembly procedure para 3-5(4). If the bolt face gets excessively dirty before 1000 rounds has been fired it can be cleaned with an Otis kit scraper tip and nylon brush and CLP or Bore Cleaner while in the weapon. If there are problems with the extractor or ejector, these parts can be removed with the bolt remaining in the weapon by use of a 30-06 cartridge case or dummy round (do not use a live round) placed into the chamber with the bolt "closed" on it. A punch can then be used to knock out the extractor from underneath (with magazine removed) which also frees the ejector (retract bolt slowly in order to keep ejector spring under control as its tension is released. 3-5

(4) All Other Parts - Clean and Lubricate all other steel parts with CLP every 1000 rounds or as needed. Always wipe dry and lightly lubricate exposed metal surfaces after exposure to adverse weather or firing to reduce corrosion potential. If any of the stainless steel screws securing the stock or top rail into position begin to drag excessively upon removal or installation apply CLP or grease to the threads to aid installation. NOTE CLP WILL PROVIDE REQUIRED LUBRICATION AT TEMPERATURES BETWEEN 0ºF AND –35ºF (-19ºC AND-37ºC). Section II. TROUBLESHOOTING PROCEDURES 3-3. TROUBLESHOOTING. a. The table lists the common malfunctions that may occur during the operation or maintenance of the rifle or its components. Perform the test/inspections and corrective actions in the order listed. 3-6

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

3-7

TABLE 3-1. TROUBLESHOOTING PROCEDURES MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION Failure to load. 1. Dirty or deformed 1. Clean or replace. ammunition. 2. Damaged magazine 2. Replace magazine. tube. 3. Dirty magazine. 3. Clean. 4. Damaged or broken 4. Replace magazine. spring. 5. Damaged or broken 5. Replace magazine. follower. 6. Loose or damaged 6. Replace magazine. floor plate. Magazine inserts 1. Bent or deformed 1. Replace magazine. with difficulty. magazine. 2. Excessive dirt in 2. Clean and lubricate. receiver well. 3. Ammunition not fully 3.a Remove seated in magazine. ammunition and reload properly. 3-8

TABLE 3-1. TROUBLESHOOTING PROCEDURES (Cont’d) MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION 3.b Lock bolt to rear Magazine inserts attempt to load. with difficulty (cont’d). 4. Return rifle to NSWC 4. Deformed or Crane. damaged operating rod spring guide. 5. Return rifle to NSWC 5. Deformed or Crane. damaged magazine latch. 6. Check movement. 6. Magazine latch Clean if necessary. movement restricted. If bent or damaged, return rifle to NSWC Crane. Magazine 1. Magazine latch 1. Return rifle to NSWC cannot be damaged or Crane. retained in deformed. weapon. 2. Magazine latch 2.a Try to reinsert 3-9

TABLE 3-1. TROUBLESHOOTING PROCEDURES (Cont’d) MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION Magazine spring damaged or magazine. cannot be broken. 2.b Return rifle to retained in NSWC Crane. weapon (cont’d). 3. Magazine latch plate 3. Replace magazine. (magazine) damaged or missing. 4. Locking recess at top 4. Replace magazine. front of magazine deformed. 5. Magazine not fully 5. Remove and install properly. Make installed. certain latch clicks. Failure to feed. 1. Damaged or dirty 1. Clean or replace ammunition. ammunition. 2. Weak or broken 2. Replace magazine. magazine spring. 3. Damaged or 3. Replace magazine. deformed magazine. 3-10

TABLE 3-1. TROUBLESHOOTING PROCEDURES (Cont’d) MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION Failure to feed 4. Damaged or 4. Return rifle to NSWC (cont’d). deformed stripping Crane. lug on bolt. 5. Short recoil. 5. Return rifle to NSWC Crane. 6. Weak or broken 6. Return rifle to NSWC operating rod spring. Crane. Failure to 1. Dirty, damaged or 1. Clean with dry cloth chamber. corroded or replace. ammunition. 2. Dirty chamber. 2. Clean barrel and chamber. 3. Weak or broken 3. Return rifle to NSWC operating rod spring. Crane. Bolt fails to lock. 1. Cartridge case 1. Pull bolt to rear and holding bolt out of remove deformed battery. cartridge case. 3-11

TABLE 3-1. TROUBLESHOOTING PROCEDURES (Cont’d) MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION Clean ammunition Bolt fails to lock and/or barrel (cont’d). chamber. 2. Clean barrel and 2. Dirty chamber. chamber. 3. Clean bolt assembly 3. Extractor does not and extractor recess snap over rim of in breech face of cartridge base. barrel, or return rifle to NSWC Crane. 4. Return rifle to NSWC 4. Frozen or blocked Crane. ejector spring and plunger. 5. Restricted movement 5. Return rifle to NSWC Crane. of, or damaged operating rod spring. 6. Return rifle to NSWC 6. Bolt not fully rotated Crane. and locked in 3-12

TABLE 3-1. TROUBLESHOOTING PROCEDURES (Cont’d) MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION Bolt fails to lock receiver. (cont’d). 7. Damaged receiver. 7. Return rifle to NSWC Crane. 1. Load magazine. Failure to fire. 1. Emptied magazine. 2. Refer to “Bolt fails to 2. Bolt not fully forward lock.” and locked. 3. Replace 3. Defective ammunition. ammunition. 4. Clean bolt or return 4. Firing pin worn, to NSWC Crane. damaged or movement restricted. 5. Return rifle to NSWC 5. Broken hammer. Crane. 6. Return rifle to NSWC 6. Weak or broken Crane. hammer spring. 7. Hammer lugs, trigger 7. Return rifle to NSWC Crane. lugs, or sear worn or broken sufficiently to 3-13

TABLE 3-1. TROUBLESHOOTING PROCEDURES (Cont’d) MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION Failure to fire cause hammer to ride (cont’d) the bolt forward. 1. Tighten plug or Short recoil. 1. Gas plug loose or return to NSWC missing. Crane. 2. Restricted movement 2. Return to NSWC Crane. of operation rod assembly. 3. Clean receiver or 3. Bolt binding. return to NSWC Crane. 4. Cylinder installed too 4. Return to armorer or NSWC Crane for far (blocks gas port) corrective action. #45 drill should fit or 0.080 inch diameter rod. 3-14

TABLE 3-1. TROUBLESHOOTING PROCEDURES (Cont’d) MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION Short recoil 5. Gas piston restricted. 5. Clean gas cylinder (cont’d). No free movement and piston. If by gravity w/bolt to damaged, return rifle rear. to NSWC Crane. 6. Damaged connector 6. Return rifle to NSWC assembly. Crane. 7. Partially closed 7. Turn valve to correct spindle valve. position (slot at 12/6 8. Improper lubrication o’clock). in cold weather. 8. Clean and lubricate properly.

3-15

TABLE 3-1. TROUBLESHOOTING PROCEDURES (Cont’d) MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION Failure to 1. Defective 1. Replace unlock. ammunition. Dirty or ammunition. Clean burred bolt. and lubricate bolt and receiver. Return rifle to NSWC Crane. Failure to hold 1. Damaged or 1. Refer to “short bolt rearward. deformed magazine recoil”. follower. 2. Damaged or 2. Return to NSWC deformed bolt lock. Crane. 3. Bolt lock movement 3. Clean bolt lock restricted. recess. If not corrected, return to NSWC Crane.

3-16

TABLE 3-1. TROUBLESHOOTING PROCEDURES (Cont’d) MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION Failure to hold 4. Weak or broken 4. Replace magazine. bolt rearward magazine spring. (cont’d) Failure to 1. Spindle valve closed. 1. Open spindle valve. 2. Remove cartridge. extract. 2. Cartridge seized in Clean chamber. chamber (sheared rim). 3. Refer to “short 3. Short recoil. recoil”. 4. Replace the 4. Damaged or extractor. deformed extractor. 5. Replace the 5. Weak, deformed or extractor and frozen extractor spring/plunger plunger, and spring assembly. assembly. 6. Remove cartridge 6. Ruptured or case or return rifle to separated cartridge NSWC Crane. case in chamber. 3-17

TABLE 3-1. TROUBLESHOOTING PROCEDURES (Cont’d) MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION Failure to eject. 1. Short recoil. 1. Refer to “short recoil”. 2. Weak, deformed or 2. Replace frozen ejector spring ejector/spring and plunger. assembly. 3-4. DISASSEMBLY PROCEDURES (Field Stripping). a. Disassemble into Three Main Groups. (1) Remove six screws securing top rail cover to barrel/receiver assembly. Lift off the top cover (includes Mil-Std-1913 rail).

3-18

3-1. Removing Top Cover. (2) Remove three screws securing operating rod guide. The bottom screw will be captured/retained by the plastic fore-grip. (3) Invert the assembly, grasp the rear of the trigger guard and pull up and toward the muzzle until the firing mechanism (trigger group) is released and can be pulled from the assembly.

3-19

Figure 3-2. Remove Firing Mechanism.

3-20

CAUTION IN WITHDRAWING THE FIRING MECHANISM FROM THE STOCK DO NOT ROTATE FIRING MECHANISM MORE THAN 90 DEGREES. DOING SO CAUSES DAMAGE TO THE RIB OR KEYWAY ON THE SIDE OF THE FIRING MECHANISM HOUSING. (4) Remove barreled action from stock chassis by inverting the receiver and pushing the stock up and away from it at the back of the receiver and the front at the gas cylinder area. If it is tight then use a tool of some sort inserted through the trigger group opening to push or tap the receiver away from the stock. The stock should pull straight up off the barreled action.

3-21

Figure 3-3. MK 14 Mod 0 Field Stripped. b. Field Stripping the Barrel and Receiver Group. (1) Removing the Connector Assembly. (See Figure 3-4) (a) Close the bolt, lay the action on the side opposite the operating rod handle. 3-22

(b) Press forward against spring pressure on the connector until it is freed from its front interface with connector lock. (c) Rotate the connector’s front end down and away from the receiver until the slot in the connector is aligned with the tab on which it pivots at the rear. (See figure 3-4). (d) Orient the selector lever so that the connector clears and remove the connector.

3-23

Figure 3-4. Removing Connector Assembly.

3-24

(2) Remove the Operating Rod Spring and Operating Rod Spring Guide. (See Figure 3-5) WARNING BE CAREFUL WHEN REMOVING AND INSTALLING SPRINGS AND SPRING LOADED COMPONENTS. WEAR EYE PROTECTION AND CONTROL SPRINGS WHILE UNLOADING THEM SLOWLY. (a) Place the barrel and receiver group on a flat surface, sight down, muzzle to the left. (b) With the left hand, pull the operating rod spring toward the muzzle to relieve pressure on the connector lock. (c) With the right forefinger, slide the connector lock (pin) toward the right side of the receiver to release the operating rod guide. Allow the operating rod spring to expand slowly and remove the operating rod spring and guide from the operating rod. 3-25

(d) Separate these two parts.

Figure 3-5. Remove Operating Rod Spring and Operating Rod Spring Guide with bolt closed. 3-26

(3) Remove the Operating Rod. (See Figure 3-6) (a) Turn the barrel and receiver group so the sights are up and the muzzle is pointed away from you. (b) Pull the operating rod handle back until the guide lug on its inside surface is aligned with the disassembly notch on the right side of the receiver. (c) Rotate the operating rod downward and outward, then pull it to the rear, disengaging it from the operating rod guide.

3-27

Figure 3-6. Remove the Operating Rod. 3-28

(4) Remove the Bolt Assembly. (See Figure 3-7) (a) Grasp the bolt and roller. (b) Slide the bolt forward, lift it upward and outward to the right front with a slight rotating motion.

3-29

Figure 3-7. Remove the Bolt Assembly.

3-30

(5) Inspect Gas Piston. (Every 250 rounds) (a) Tip barrel up and down and ensure free movement of gas piston. (b) If gas piston does not move smoothly, remove gas cylinder plug using combination tool. (NSN 4933-00-768-0211 or 3/8 box-end wrench) (c) Remove gas piston. (d) Clean gas piston grooves and bore. (e) Clean gas cylinder bore. (f) Reinstall gas piston and gas piston plug. (Do not lubricate). freely.

(g) Tip rifle up and down and ensure gas piston moves (6) Disassemble Magazine. (See Figure 3-8) 3-31

WARNING BE CAREFUL WHEN REMOVING AND INSTALLING SPRING LOADED COMPONENTS. CARELESSNESS COULD CAUSE INJURY. (a) Use a pointed object to raise the rear of the magazine base clear of the magazine. (b) Grasp the magazine with either hand, with one finger of the hand covering the base. (c) Remove the magazine base and guide the spring, one coil at a time, to clear the retaining lips of the magazine. (d) Remove and separate the magazine spring and follower.

3-32

Figure 3-8. Magazine Assembly.

3-33

3-5. CLEANING, INSPECTION, AND REPAIRS. WARNING BEFORE CLEANING, BE SURE TO CLEAR THE WEAPON. a. General. (1) With the rifle disassembled and thoroughly cleaned, inspect and lubricate. (2) Always shake CLP before use. (3) After firing, clean your rifle according to instruction. Wipe dry and lubricate according to lubrication instructions. (4) Cleaning materials are expendable items and are available from supply.

3-34

CAUTION Do not interchange parts of your weapon with other weapons. b. Barrel and Bore. (1) Using an Otis 7.62mm patch or a standard two inch patch with a small hole in the center, place top of Otis kit/bore snake through hole in patch and then pull corner of patch back through slot in tip of Otis kit/bore snake. Place a few drops of CLP on leading edge of the patch and pull patch through bore, using T-handle, from chamber to muzzle (after first rotating patch in chamber neck area to clean). Remove the slotted brass tip and reinsert the cable from the muzzle. Install the bore brush and pull through the bore. Reinstall the slotted tip and reorient patch to a clean area and pull through bore dry. (2) Repeat procedure in (1) until the patch comes out clean. (3) Clean chamber using the short cable and Otis kit chamber brush with T-handle. Rotate brush clockwise and feed it into 3-35

chamber fully, continuing to rotate brush as it is extracted. Change to the slotted tip and insert a two inch patch and mop out chamber. If weapon is to be stored apply a light coat of CLP to chamber and bore using kit. c.

Face of Bolt.

(1) Clean the face of the bolt using Otis kit scraper and nylon brush as well as two inch patches and CLP as necessary. NOTE Bolt can remain in rifle to clean the bolt face. (2) Wipe the bolt dry with patches and lubricate with a light coat of CLP. d. All Other Parts. (1) Use a dry cloth to remove all dirt or sand from other parts and exterior surfaces. 3-36

(2) Apply a light coat of CLP to the metal parts. (3) Lubricate rifle in accordance with paragraph 3-2. e. Clean the magazine. (1) Remove dirt, grit, or other foreign matter with a clean wiping cloth. (2) In general a light coating of CLP on all internal magazine component surfaces is best. a. In dusty desert conditions, totally wipe parts dry. Adding some powdered graphite may also improve operation of the magazine. b. Heavier lube is better in damp environments to enhance corrosion resistance. 3-37

Section III. INSPECTION INSTRUCTIONS. NOTE INSPECT BEFORE LUBRICATING. a. General. (1) Inspect stock system for loose or missing screws, cracks, or breaks. Function telescoping/operating components. (2) Inspect flash suppressor for cracks, bent tines, and looseness. The flash suppressor can be tightened using ¾ inch wrench or 3/16 hex key on EBR tool run through base of opposing slots of the flash suppressor. Tighten flash suppressor to 5-10 ft-lbs torque. (3) Inspect barrel for straightness, cracks, burrs. (4) Inspect gas piston for free movement. 3-38

b. Bolt Assembly. Inspect for damage, missing parts and or proper functioning. c. Operating Rod and Connector Assembly. Inspect for damage and for proper functioning. Dry cycle check both semi-auto and fullauto function upon reassembly (refer to paragraph 3-9). d. Bipod Assembly. Check the bipod functioning, and security (snug knurled attachment screw and slotted screw on bipod rail mount), and for visual damage. e. Sights. Check rear sight for damage, missing or loose parts and functioning. f.

Check bipod mount knurled knob for looseness.

3-6. REASSEMBLY PROCEDURES (from field strip). a. Assemble the Magazine. (Refer to Figure 3-8) 3-39

(1) Reposition the spring inside the follower with the rectangular-shaped end of the spring against the rear of the follower, and replace the follower and spring inside the magazine. Ensure to fully seat the follower. (2) Replace the magazine base. b. Install the Bolt. (Refer to Figure 3-7) (1) Place the barrel and receiver on the table, sights up, muzzle pointing away from you. (2) Hold the bolt by the roller and locking lug and place the rear on the bridge of the receiver, firing pin tang pointed down. (3) Turn the bolt slightly counterclockwise until the tang of the firing pin clears the bridge. (4) Guide the left locking lug of the bolt into its groove on the left side of the receiver. 3-40

(5) Lower the right locking lug on its bearing surface and slide the bolt halfway to the rear. c.

Install the Operating Rod. (Refer to Figure 3-6)

(1) Hold the operating rod at the handle, place the front end into the operating rod guide and position the rod so that the recess in the hump fits over the bolt roller. (2) Turn the operating rod counterclockwise in the operating rod guide until the guide lug fits into the disassembly notch on the receiver. (3) Then move the operating rod forward until the bolt is closed. d. Install the Operating Rod Spring and Operating Rod Spring Guide. 3-41

(1) Turn the barrel and receiver over so the sights are down and the muzzle is to the left. (2) Place the operating rod spring guide into the operating rod spring, hump up, and feed the loose end of the spring into the operating rod. (3) Grasp the spring and guide with the left hand and compress the spring until the hole in the guide can be aligned with the connector lock. Lower the guide and push the connector lock in with the right thumb to retain the spring guide. e. Install the Connector Assembly. (Refer to Figure 3-4) (1) Close the bolt and lay the action on the side opposite the operating rod handle. (2) Orient selector lever until the connector clears.

3-42

(3) Install connector on tab on which it pivots and rotate the front connector up toward the receiver, pressing forward until it snaps onto the connector lock. f.

Assembly the Three Main Groups.

(1) Place the barrel and receiver group on a flat surface, sights down. (2) Place the chassis stock directly onto the receiver from above being sure the receiver “legs” fit into recesses and the operating rod guide fits into the front stock channel. (3) Open the trigger guard and place the firing mechanism straight down into the receiver, making sure that the guide rib on the firing mechanism enters the recess in the receiver. (4) Once the receiver is fully seated into the stock (may require tapping with a mallet) then close the trigger guard, ensuring that it clears the trigger and fully engages the receiver. 3-43

(5) Install three screws securing the operating rod guide and secure to approximately 65 in lb torque. (6) Install top rail to the stock and secure with six screws. Torque screws to 35 in lbs. (Anti-seize compound or grease can be applied to the screw threads). 3-7. SCOPE MOUNTING. (As Required) NOTE Any 30mm tube scope can be used. Prior to final installation be sure that rings are set to proper spacing to allow both recoil lugs to engage slots and have full recoil lug contact. A scope that has been mounted on one MK 14 may need a ring slightly adjusted to fit another MK 14 properly. 30mm to one inch adapters (not provided) would be required to use one inch tube scopes. 3-44

NOTE Scope rings should be installed so that the hex nuts are on the left side. a. Loosen ½ inch hex nuts screws only enough to allow scope rings to be fully seated on the mounting rail. b With the nuts slightly loose, position clamps and push the scope as far forward as the recoil grooves allow. c While holding the scope forward, finger tighten front hex nut as much as possible. Repeat for the rear hex nut. d turn.

Tighten the front and rear hex nut an additional one-quarter

e This procedure will be close to the desired torque value, (65 in-lbs) and repeat a good zero if performed exactly the same each time. 3-45

3-8.

DAY OPTIC SIGHT REMOVAL.

a. Loosen the front and then the rear mounting ring hex nuts while holding the scope firmly against a mounting rail. b. Holding left side of rifle downward, rotate scope away from the mounting ring hex nuts to disengage from the mounting rail. 3-9. FUNCTION CHECK. WARNING Before starting an inspection, be sure to clear the weapon. Do not actuate the trigger until the weapon has been cleared. Remove magazine so no ammunition is in position to be fed into the chamber, and then inspect the chamber to ensure it is empty. a. Inspect sights for damage and loose or missing parts.

3-46

b. Install empty magazine and assure it locks into place and does not bind. c.

Release the bolt lock; verify bolt slides forward.

d. Press safety forward. Verify selector is in semi-automatic mode (A facing forward – not visible). e. Squeeze trigger; hammer should fall. f.

Remove empty magazine.

g. While squeezing trigger, pull operating rod to rear and ensure proper operation. Hammer should remain cocked upon release of operating rod handle. Slowly release trigger pressure – Hammer should remain cocked. (Should hear a click from it jumping from disconnector to the hammer sear hook). h. Press in and rotate the selector so the “A” facing rearward and cycle the action to cock the hammer, squeeze trigger to release 3-47

hammer. Hold trigger to rear while hand cycling operating rod slowly and allow action back into full battery, hammer should not fall until last ½ inch of forward travel. i. Rotate windage knob and elevating pinion assembly of rear sight, to ensure proper operation. Medium pressure down on the aperature should not shift elevation adjustment (if shift does occur, tighten screw in windage knob another click and recheck). j. Pull operating rod to the rear, release operating rod, and ensure action is smooth. k.

Remove empty magazine.

l.

Release bolt lock and squeeze trigger.

3-48

CHAPTER 4 MAINTENANCE OF AUXILIARY EQUIPMENT 4-1. CLEAN BIPOD ASSEMBLY a. Clean and check bipod assembly for proper operation and lightly lubricate with CLP. b. Return bipod to unit armorer for corrective action if problems exist. Get a replacement bipod issued if required since it is not repairable at unit level.

4-1/(4-2 Blank)

CHAPTER 5 AMMUNITION 5-1. AMMUNITION. Other standard ammunition types may be authorized by individual commands (any standard 7.62mm NATO ammunition should function). WARNING DO NOT FIRE: Seriously corroded ammunition Dented cartridges Cartridges with loose bullets Cartridges exposed to extreme heat (135ºF until they have cooled) • Cartridges with the bullet pushed in (short rounds) Turn in defective ammunition to range Noncommissioned Officer (NCO). • • • •

Keep ammunition dry and clean. 5-1

Table 5-1. MK14 Mod 0 Ballistic Information MK14 MOD 0 Ballistic Info. 18 in. barrel/Standard Conditions M80 Ball muzzle vel. = 2675 fps M118LR muzzle vel. = 2511 fps Impact vs. Line of Sight (LOS) 300 yd M80 M118LR 100 yd M80 M118LR ZERO Path Path ZERO Path Path Yards Inches Inches Yards Inches Inches 0 -1.2 -1.2 0 -1.2 -1.2 25 0.9 1.1 25 -0.4 -0.4 50 2.8 3.1 50 0.1 0.1 75 0.2 0.3 75 4.3 4.7 100 0 0 100 5.9 5.4 125 6.2 6.7 125 -0.6 -0.7 150 6.7 7.1 150 -1.5 -1.8 175 6.7 7.1 175 -2.9 -3.3 200 200 6.6 -5.2 6.2 -4.6 225 5.4 5.7 225 -6.9 -7.7 250 4.1 4.3 250 -9.5 -10.6 275 2.3 2.4 275 -12.7 -13.9 300 0 0 300 -16.3 -17.8 5-2

Table 5-1. MK14 Mod 0 Ballistic Information (cont’). MK14 MOD 0 Ballistic Info. 18 in. barrel/Standard Conditions M80 Ball muzzle vel. = 2675 fps M118LR muzzle vel. = 2511 fps Impact vs. Line of Sight (LOS) 300 yd M80 M118LR 100 yd M80 M118LR ZERO Path Path ZERO Path Path Yards Inches Inches Yards Inches Inches 325 350 375 400 425 450 475 500

-2.7 -6 -10 -14.7 -20 -26.1 -33 -40.6

-2.8 --6.3 -10.3 -15.1 -20.5 -26.6 -33.4 -41

325 350 375 400 425 450 475 500

5-3/(5-4 Blank)

-20.4 -25.1 -30.4 -36.5 -43.2 -50.6 -58.9 -67.8

-22.1 -27 -32.6 -38.8 -45.7 -53.3 -61.6 -70.6

APPENDIX A BASIC ISSUE ITEMS (BII) LIST Section I. INTRODUCTION A-1. SCOPE. This appendix lists the basic issue items (BII) for the MK 14 MOD 0 7.62mm Enhanced Battle Rifle (EBR). A-2. BASIC ISSUE ITEMS (BII) LIST. The BII list is described as follows: These are minimum essential items required to place the MK 14 MOD 0 EBR into operation and to perform emergency repairs. Although shipped separately packaged, BII must be with the MK 14 MOD 0 EBR 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 authorization of the end item.

A-1

A-3. EXPLANATION OF COLUMNS. The following provides an explanation of columns found in the tabular listing: Column (1)- Item Number (I. No.). This column indicates the number on the illustration on page A-3. Column (2)- National Stock Number. Indicates the national stock number (NSN) assigned to the item and will be used for requisitioning purposes. Column (3)- Description CAGE 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 (CAGE) 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-2

MK 14 MOD 0 EBR Accessories. A-3

Section II. BASIC ISSUE ITEMS

1 2 3

(2) NATIONAL STOCK NUMBER Eagle Industries Buffer Technologies Badger Ordnance

4

MSC

5

Harris Engineering

6

Knights Armament

7

1005-01-451-5119

8

Hoppes

(1) ITEM NO.

(3) DESCRIPTION,

(4) U/M

Storage Case DCM14 Sling, Rifle TAS-M14 Scope Rings 1005306-29 MK 14 EBR Tool (Bondhus/MSC) 67255281 Bipod (Harris) 1A2-BRM Adapter Plate, Bipod 98060 M14 Cleaning Kit (Otis) 308-6 .30 Caliber Bore Snake 24015

Ea Ea Pr

(5) QTY REQ 1 1 1

Ea

1

Ea

1

Ea

1

Ea

1

Ea

1

A-4

9 10 11

(2) NATIONAL STOCK NUMBER 1005-00-628-9048 Shooters Choice 4933-00-768-2011

12 13

0000-00-005-9811 0640-LP-103-7282

(1) ITEM NO.

(3) DESCRIPTION,

(4) U/M

Magazine Assembly Grease Combination Tool, MK14 7790769 Weapons Record Book Operator’s Manual, 7.62mm MK 14 MOD 0 Enhanced Battle Rifle (EBR)

Ea Ea Ea

(5) QTY REQ 2 A/R 1

Ea Ea

1 1

A-5/(A-6 Blank)

APPENDIX B ADDITIONAL AUTHORIZED LIST Section I. INTRODUCTION B-1. SCOPE. This appendix lists additional items you are authorized for the support of the MK 14 MOD 0 Enhanced Battle Rifle (EBR), 7.62mm. B-2. GENERAL. This list identifies items that do not have to accompany the MK 14 MOD 0 EBR and that do not have to be turned in with it. These items are all authorized to you by Table of Authority (TOA). B-3. 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

B-4. EXPLANATION OF COLUMNS. The following provides an explanation of columns found in the tabular listing: 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 CAGE and Part Number. Indicates the Federal item name and if required, a minimum description to identity and locate the item. The last line for each item indicates the Commercial and Government Entity Code (CAGE), 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

1. Low Profile AN/PEQ Mount – This low profile mount can be mounted on the top rail or either side mount.

2. Throw-lever mount for 30mm tube sight. B-3

3. Adjustable height night vision pocket scope mount (M983/PVS-18) which is part of the SOPMOD Accessory kit. This mount attaches to the rear rail behind the receiver. Shown with a ½ inch riser block available from Mounting Solutions Plus which optimizes height. 4. A Universal Night Sight (UNS-AN/PVS-22) can be used on the front top rail with magnified optics.

B-4

5. The AN/PVS-17 series Mini Night Vision Sight can be adapted to fit the rear rail if a requirement existed.

B-5/(B-6 Blank)

APPENDIX C EXPENDABLE/DURABLE SUPPLIES AND MATERIALS LIST Section I. INTRODUCTION C-1. SCOPE. This appendix lists expendable supplies and materials you will need to operate and maintain the MK 14 MOD 0 7.62mm Enhanced Battle Riffle. C-2. EXPLANATION OF COLUMNS. The following provides an explanation of columns found in the tabular listing: a. Column (1)- Item Number (Item Number). This number is assigned to the entry in the listing and is referenced in the narrative instructions to identify the material (e.g., “Use wiping rag, item 4, app D).

C-1

b. Column (2)- Level. This column identifies the lowest level of maintenance that requires the listed item. c. Column (3)- National Stock Number. This is the National Stock Number assigned to the item; use to request or requisition the item. d. Column (4)- Description. Indicates the Federal Item Name and if required, a description to identify item. The last line for each item indicates the Contractor and Government Entity Code (CAGE) in parentheses followed by the part number. e. Column (5)- Unit of Measure (U/M). Indicates the measure used in performing the actual maintenance function. This measure is expressed by a two-character alphabetical abbreviation (e.g., ea., in., pr.). If the unit of measure differs from the unit of issue, requisition the lowest unit of issue that will satisfy your requirements.

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Section II. EXPENDABLE/DURABLE SUPPLIES AND REQUIREMENTS LIST (1) Item No

(2) Level

(3) National Stock Number

(4) Cage Part Number

(5) U/M

1

Operator

1005-00-494-6602

ea

2

Operator

9150-01-054-6453

Brush, Cleaning, Small Arms (19204) 8448462 Cleaner, Lubricant Preservative (81349) MIL-L63460 4 oz. bottle 1 pint bottle 1 gal. can

9150-01-079-6124 9150-01-054-6453 9150-01-053-6688

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OZ PT GAL

(1) Item No

(2) Level

(3) National Stock Number

(4) Cage Part Number

(5) U/M

3

Operator

7920-00-205-1711

LB

4

Operator

Rag, Wiping (58536) A-A-2522 50 lb. Bale Compound, Cleaning, Simple Green (1Z575) 5 gal container 1 gal container 24 oz bottle Solvent, Cleaning, Skysol 100 Shooters Choice Bore Cleaner

5

Operator

7930-01-342-5316 7930-01-306-8369 7930-01-342-5317 6850-01-381-4401

6

Operator

N/A

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GAL GAL OZ OZ GAL

C-5/(C-6 Blank)