Technical data

TM 9-1005-319-23&P 0021
0021-12
INSPECTION — ACCEPTANCE AND REJECTION CRITERIA - Continued
NOTE
If a weapon's lower receiver is missing one third or more of its exterior protective
finish, resulting in an unprotected, light-reflecting surface, it is candidate for
overhaul. This missing finish will be considered a shortcoming. This shortcoming
requires action to obtain a replacement weapon. Once a replacement has been
received, evacuate the original weapon to depot for overhaul.
6. Inspect for missing or damaged parts. Inspect finish of lower receiver for shiny spots. Touch up with
solid film lubricant (WP 0045, item 20) as required. See WP 0015 for procedure to repair shiny
surfaces.
END OF TASK
REPAIR OR REPLACEMENT
Repair or replace all defective parts of lower receiver and buttstock assembly as authorized by WP 0039.
ASSEMBLY
1. Clean and remove carbon deposits from all items. Lightly lubricate all metal components. Refer to TM
9-1005-319-10.
1 v s 1 8 5
3 8
3 8
3 9
3 2
3 5
3 6
3 7
Figure 17. Installation of Trigger Assembly (M16A2/M16A4/M4).
2. Assemble semiautomatic disconnector (35), burst disconnector (36), and trigger assembly (37). Install
as a unit in lower receiver and receiver extension assembly (32) using slave pin (38) (WP 0030, Figure
5).
3. Install trigger pin (39) using drive pin punch. Push in until flush. Push out slave pin (38).