Technical data

TM 9-1005-319-23&P 0008
0008-16
PMCS PROCEDURES - Continued
Table 1. Preventive Maintenance Checks and Services for
M16 Series Rifles and M4 Series Carbines - Continued.
Item
No.
Interval
Man-
Hour
Item To Be
Checked or
Serviced
Procedure
Equipment Not
Ready/Available
If:
5 Quarterly Key and Bolt
Carrier Assembly
and Bolt Assembly
(Serviceability
Check)
WARNING
Unless performed by
qualified maintenance
personnel, do not
interchange bolt
assemblies from one
weapon to another.
Doing so may result in
injury to, or death of,
personnel.
a. Remove and disassemble (WP
0011). Visually inspect bolt
assembly (22) for cracks,
especially in the area of the
bolt cam pin hole (27). Check
for cracks on locking lugs (28),
for a cluster of pits or chipped
bolt face (29), and for an
elongated firing pin hole (30).
If cracked or broken, replace.
a. Defects are
found.
b. Check for worn or missing bolt
rings (31). Check for proper
staggering of bolt rings. Insert
bolt assembly (22) into key and
bolt carrier assembly (23).
Turn key and bolt carrier
assembly so bolt assembly
points down. Bolt assembly
must not drop out. Remove bolt
assembly. Check for broken or
missing firing pin retaining pin
(32) and bolt cam pin (33);
replace as necessary.
b. Bolt assembly
drops out of key
and bolt carrier
assembly due to
its own weight.
Firing pin
retaining pin or
bolt cam pin is
missing or
broken.