Slight rotational and lateral movement looseness of the Piston is normal and not cause for rejection Do not lubricate Piston

Rifle 3220

2. Notify Direct Support Maintenance if any parts are damaged or missing, and if loosens_

2-14. MAINTENANCE OF HEAT SHIELD.

This task covers:

Inspection/Repair

INITIAL SETUP

Tools and Special Tools

References

Tool Kit, Small Arms Repairman

TM 9-1005-201-10

SC 5180-95-CL-A07

TM 08671A-10/1A

Tool Kit, Small Arms Repairman

USMC TAM No. E2900

Equipment Condition

Heat Shield Assembly removed.

Personnel Required

MOS 76Y Supply Clerk/Unit Armorer

MOS 2111 Infantry Weapon Repairer

(USMC)

1. Visually inspect Shield (1) for cracks and/or breaks; Liner (2) for bends and/or dents; two Barrel Clips (3) for bends; four Clip Ends (4) for cracks or breaks; Barrel Locator (5) for bends; and four Rivets (6) and six Rivets (7) for looseness.

M249 Barrel Components

NOTE

Some heat distortion or charring may be observed on the outer non-metallic portion of the heatshield assembly and is not cause for replacement.

2. Replace Heat Shield Assembly (1) if any components are damaged or missing.

2-15. MAINTENANCE OF BARREL ASSEMBLY, GAS COLLAR AND GAS REGULATOR.

This task covers:

Disassembly/inspection/Repair/Reassembly

INITIAL SETUP

Tools and Special Tools

References

Tool Kit, Small Arms Repairman

TM 9-1005-201-10

SC 5180-95-CL-A07

TM 08671A-10/1A

Tool Kit, Small Arms Repairman

| TM 9-4933-273-12&P

USMC TAM No. E2900

Box Spanner 9350031

Equipment Condition

Wrench, Spanner 9350033

1 Barrel Assembly (12556957 (old style),

1 12011986 (new style)) removed.

Personnel Required

1 Gas Collar and Gas Regulator

MOS 76Y Supply Clerk/Unit Armorer

I Removed.

MOS 2111 Infantry Weapon Repairer

(USMC)

WARNING

Barrel Assemblies or Bolt Assemblies must NOT be interchanged with other M249 Machine Guns unless they have been checked for proper headspace by Direct Support Maintenance.

M249 Barrel

CAUTION

Gas Collar and Gas Regulator must be removed from Old Style barrel before putting Barrel Assembly (2) in vise which must have Protective Barrel Jaws (1).

1. Use an adjustable wrench to remove Compensator (3) from both Old and New Style barrel. Turn counterclockwise (CCW) to remove (right-hand threads).

2. Remove Compensator Washer (4) from New and Old Style barrel and discard.

M14 Barrel Removal Headspace
1JDU076

Change 7

3. Using 10mm end of Box Spanner (5) remove Nut (6) and discard. Separate Washer (7) and Grip (8). NOTE

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