Technical data

TM 9-1005-319-23&P 0009
0009-7
3 L B
( 1 3 6 1 G )
2 L B
( 9 0 7 G )
2 L B 8 O Z
( 1 1 3 4 G )
1 L B 8 O Z
( 6 8 0 G )
2 L B 8 O Z
( 1 1 3 4 G )
1 v s 0 5 3
Figure 2. Trigger Pull Test.
b. Release the trigger. Place the selector lever in SEMI position. Hold the weapon in the vertical
position. Using trigger pull measuring fixture, P/N 7274758, add weights until hammer trips.
Determine weight applied.
c. Hammer must not trip when 5.5 lb (2.49 kg) have been applied; hammer must trip on applying
9.5 lb (4.31 kg).
M16A3 and M4A1 ONLY
d. Clear the weapon. Cock weapon. Place selector lever in SEMI position and hold weapon in vertical
position.
e. Using trigger pull measuring fixture P/N 7274758, add weights until hammer trips. Determine
weight applied.
f. Hammer must not trip when 5.5 lb (2.49 kg) have been applied. Hammer must trip on applying
8.5 lb (3.86 kg).
ALL WEAPONS
g. If weapon fails trigger pull test or excessive creep is present, replace trigger assembly and/or
hammer assembly (see WP 0021).
NOTE
Always gage trigger and hammer pin holes with no go plug gage P/N 12006472 before
replacing parts.
10. Check headspace using headspace gage P/N 7799734. See WP 0015.
11. Check firing pin protrusion using firing pin protrusion gage P/N 7799735. See WP 0015.
12. Check extent of barrel erosion using barrel erosion gage P/N 8448496. See WP 0015.