Technical data

TM 9-1005-319-23&P 0021
0021-13
M16A3 and M4A1 ONLY
1 v s 1 8 6
3 9
3 2
4 0
4 1
4 2
Figure 18. Installation of Trigger Assembly (M16A3/M4A1).
4. Install trigger assembly (40), disconnector spring (42), and disconnector (41) into lower receiver and
receiver extension assembly (32).
5. Install trigger pin (39) using drive pin punch. Push in until flush.
1 v s 1 8 7
3 9
3 4
3 3
3 9
3 4
Figure 19. Installation of Hammer Assembly.
NOTE
Ends of hammer spring are installed to rear of trigger pin (39), resting in the annular
groove on upper surface of trigger pin.
6. Install hammer assembly (33).
7. Install hammer pin (34) using drive pin punch. Push in until flush.