Disassembly

M249 Disassembly
CLEANING/INSPECTION/REPAIR

1. Thoroughly clean Slide Body (1) using CLP (item 1, app D), and wipe dry with Wiping Rag (item 3, app D). Slide Body (1) must be free of oil, dirt, corrosion and carbon prior to inspection.

2. Inspect Slide Body (1) for cracks using Inspection Penetrant (item 6, app D). Inspect top of Slide Body (1) for bulges caused by a cookoff. If cracked or bulged, replace.

3. Inspect Feed Roller Assembly (2). It must rotate freely. Replace if bent, broken or does not rotate freely.

4. Visually inspect Spring (3). Replace if broken or has lost tension.

5. Visually inspect Pivot Slide (4). Replace if broken or cracked.

M249 Machine Gun Disassembly

REASSEMBLY

1. Install Pivot Slide (1) into Slide Body (2) with flat portion facing spring pin hole. Drive in NEW Spring Pin (3) flush with bottom of Slide Body (2).

2. Place Slide Body (2) in a protected jawed vise with roller hole facing you.

3. Install Spring (4) and Roller Assembly (5) in Slide Body (2). Aline flat portion of Roller Assembly (5) with pin hole in Slide Body (2).

4. Compress Roller Assembly (5) and install NEW Spring Pin (6). Pin (6) must not protrude from either side.

NOTE

Assure both spring pins are Installed with flat (open) sides toward non-functional sides of Pivot Slide (1) and Roller Assembly (5).

3-9. MAINTENANCE OF PISTON ASSEMBLY.

This task covers:

Inspection/Repair

INITIAL SETUP

Personnel Required

MOS 45B Small Arms Repairer MOS 2111 Infantry Weapon Repairer (USMC)

References TM 9-1005-201-10 TM 08671A-10/1A

Nsn For Part Number 325 Caps Vise Jaw

Equipment Condition

Bolt and Slide Assemblies removed from Piston Assembly.

M249 Machine Gun Disassembly

3-9. MAINTENANCE OF PISTON ASSEMBLY (Cont).

INSPECTION AND REPAIR

CAUTION

Piston (3) and Tube Portion (6) are adjusted at the factory and are NOT to be disassembled or altered.

1. Visually inspect Piston Assembly (1) for bends, breaks, or cracks. Visually inspect hole (2) for cracks. Visually inspect Piston (3) for missing Spring Pins (4). Inspect for looseness between Tower Portion (5) and Tube Portion (6).

NOTE

Slight rotational and lateral movement (looseness) of the Piston (3) is normal and not cause for rejection. DO NOT lubricate Piston (3).

M249 Gass Tube Regulator

2. If any parts are damaged or missing, and if looseness exists between Tower Portion (5) and Tube Portion (6), replace Piston Assembly (1).

3-10. MAINTENANCE OF BARREL ASSEMBLY.

This task covers:

Disassembly/Inspection/Repair/Reassembly

INITIAL SETUP

Tools and Special Tools

References

Shop Set, Small Arms, Field Maintenance

TM 9-1005-201-10

SC 4933-95-CL-A11

TM 08671A-10/1A

Tool Kit, Small Arms Repairman

TM 9-4933-273-12&P

USMC TAM No. E2900

Tool, Adjusting, Front Sight Base

Equipment Condition

9350034

Barrel Assembly removed.

Tool, Assembly, Front Sight

Gas Collar and Gas Regulator

12540422

removed.

Gage, Breech Bore Erosion

9350096

Personnel Required

Gage Headspace 9350102

MOS 45B Small Arms Repairer

MOS 2111 Infantry Weapon Repairer

NOTE

Disassembly instructions are identical for both old and new style barrel assemblies.

1. Drive out Spring Pin (1) from right to left side of Front Sight Base (2) using 5/16" punch and alternating strikes from top to bottom to reduce binding. Discard Spring Pin (1).

NEW STYLE BARREL SHOWN

1JDU136

Front Sight Post Adjustment Tool M249

NEW STYLE BARREL SHOWN

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Responses

  • Chantelle
    How to disassemble and reassemble an m249?
    2 years ago
  • gundobad
    How to 50 cal disassembly usmc?
    2 years ago

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