Corrective Action

9. FAILURE TO COCK.

Step 1. Worn or broken trigger nose (1) or trigger spring (2).

Replace trigger (3) or defective trigger spring (2) (p 3-62). Step 2. Worn or broken hammer trigger notch (4).

Replace hammer (5) (p 3-62). Step 3. Worn or broken hammer disconnector hook (6).

Replace hammer (5) (p 3-62). Step 4. Worn or broken hammer automatic sear hook (7). Replace hammer (5) (p 3-62).

Change 4 3-7

3-5. TROUBLESHOOTING PROCEDURES (CONT).

TROUBLESHOOTING (CONT)

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

Step 5 (M4A1 has only 1 disconnector) Worn or broken disconnector hooks (8).

Replace defective disconnectors (9) (p3-62). Step 6 (M4A1 has only 1 spring) Weak, broken, or missing disconnector springs (10).

Replace disconnector springs (10) (p 3-62). Step 7. Worn, broken, or missing automatic sear (11).

Replace automatic sear (11) (p 3-62). Step 8 Weak or broken automatic sear spring (12).

Replace automatic sear (11) (p 3-62). Step 9. Long leg (13) of automatic sear spring incorrectly assembled in receiver.

Remove automatic sear assembly (11) and install correctly (p 3-62). Step 10. (M16A2 and M4 ONLY) Burst cam (14) or clutch spring (15) frozen or improperly assembled.

Disassemble, inspect, clean, lubricate, or replace as required (p 3-73).

M16a2 Clutch Spring

M4A1

8 Change 4

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