Technical data

TM 9-1005-319-23&P 0005
0005-10
M16 SERIES RIFLE/M4 SERIES CARBINE - Continued
Table 1. Troubleshooting Procedures - Continued.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
9. FAILURE TO COCK.
Step 1. Inspect for worn or broken trigger nose (24) or trigger spring (25).
Replace trigger (23) or defective trigger spring (WP 0024).
Step 2. Inspect for worn or broken hammer trigger notch (28).
Replace hammer (10) (WP 0021 and WP 0023).
Step 3. Inspect for worn or broken hammer disconnector hook (27).
Replace hammer (10) (WP 0021 and WP 0023).
Step 4. Inspect for worn or broken automatic sear hook (26).
Replace hammer (10) (WP 0021 and WP 0023).
1 v s 0 1 7
2 3
2 4
2 5
1 0
2 6
2 7
2 8
2 3
2 4
2 5
2 6
1 0
M 1 6 A 2 , M 1 6 A 4 , a n d M 4 O n l y
M 1 6 A 3 a n d M 4 A 1 O n l y
Figure 14. Trigger and Hammer Inspection.
Step 5. (M16A3 and M4A1 have only one disconnector) Inspect for worn or broken
disconnector hooks (29).
Replace defective disconnectors (30) (WP 0021).
Step 6. (M16A3 and M4A1 have only one spring) Inspect for weak, broken, or missing
disconnector springs (34).
Replace disconnector springs (WP 0021).