Inspectionrepair

1. Visually inspect for broken or cracked Lock Tabs (1), cracked or missing Leg Hooks (2), broken or bent Feet (3), broken Spring Pins (4), bent Outer (upper) Leg Section (5), or Inner (lower) Leg Section (6), and cracks in Yoke (7) or Pivot (8).

2. Inspect for spring tension on Latch (9). Inspect for spring tension between leg assemblies.

M249 Takedown Pin

3. If there is unintentional extension of the Inner (lower) Leg Section (6) of the bipod, or here are damaged or missing components, notify Direct Support Maintenance._

2-21 MAINTENANCE OF RECEIVER ASSEMBLY.

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

USMC TAM No. E2900

Equipment Condition

Field stripped.

Personnel Required

MOS 76Y Supply Clerk/Unit Armorer

Materials/Parts

MOS 2111 Infantry Weapon Repairer

Retaining Clip 9348225

(USMC)

Retaining Clip 9348245

Spring Pin (2) 9348218

DISASSEMBLY/NSPECTION/REPAIR/REASSEMBLY

M249 Receiver Parts

1. Compress Retaining Clip (1) loose from Receiver (2) and lift Ejector (3) from Receiver (2).

2. Remove Retaining Clip (1) and Cartridge Ejector Pin (4) from Cartridge Ejector (3). Discard Retaining Clip (1).

M249 Cleaning Kit

3. Visually inspect for cracks, bends, or damage.

NOTE

Tip of ejector must be well defined to ensure proper ejection. Cleaning rods can easily damage ejector tips when they are used to assure weapons are cleared on the training ranges.

4. Replace any unserviceable parts.

5. Remove and discard Retaining Clips (5) and (6) from Headed, Grooved Pin (7) and Grooved Pin (8) on rear portion of Receiver Assembly (2).

6. Remove Headed, Grooved Pin (7) from Receiver Assembly (2).

7. Remove Grooved Pin (8) and Retaining Clip (9) from Receiver Assembly (2).

8. Visually inspect parts for cracks, breaks or burrs. Replace all unserviceable parts.

9. Inspect Receiver Assembly (2) for cracks in areas indicated with arrows:

M249 Receiver

a. Inspect for cracks in welds around Magazine Sleeve (10) both sides.

b. Inspect for cracked, bent or missing Handguard Tab (11).

c. Inspect for cracked or broken Sling Holes (12), both sides.

d. Inspect for cracks in welds of Gas Cylinder Support (12.1), both sides.

e. Inspect for cracks in the rear radii of the Trigger Mechanism Slot (12.2) on the bottom of the receiver.

f. Inspect for cracks in the Upper Front Radius (12.3) on the ejection port cut out.

g. Inspect for elongation and cracks of the Take Down Pin Hole (13) in the inner rail, at the rear of the receiver, both sides.

h. Inspect for cracked or bent Transfer Mechanism Assembly Catches/Hooks (14) inside the receiver, both sides.

M249 Trigger Assembly

2-21. MAINTENANCE OF RECEIVER ASSEMBLY (Cont).

DISASSEM BLY/INSPECTION/REPAIR (Cont).

| i. Inspect for loose cocking handle stop (NEW Style). Inspect for cracks in the radii (just forward of the stop) of the cocking handle channel.

NOTE

Cover and Feed Mechanism Assembly shown removed for clarity.

Machinegun Feed Mechanism

NEW STYLE COCKING HANDLE STOP

1JDU108

10. Inspect receiver for bends/damage:

a. Inspect for bent pivot/trigger mechanism flanges on bottom rear of receiver, both sides.

b. Inspect for damaged or bent rails by charging and clearing the weapon to detect if binding occurs.

NOTE

Flanges shown exaggerated for clarity.

GOOD

flanges

11. Inspect cocking handle channel for damage:

a. Inspect for separation of cocking handle channel from the receiver side wall.

SEPARATION

a. Inspect for separation of cocking handle channel from the receiver side wall.

SEPARATION

Welding M249 Receiver
1JDU110

b. Inspect the upper rail of the cocking handle channel for a bulge just rear of the cocking handle stop.

BULGE

c. Inspect for worn rails and for presence of notches created by a machining cleanup of excess weld material at new manufacture.

12. Inspect for damaged/bent magazine dovetails on the bottom of the receiver.

249 Diagram

13. Inspect left side slide assembly rail (1) (inside receiver) for looseness. NOTE

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