Technical data

TM 9-1005-319-23&P 0029
0029-5
10. The sear, hammer, and/or cocking notches must be in good condition. Chipped engaging corners will be
cause for rejection. Slight wear on functional surfaces, including engaging corners, shall be acceptable,
providing the minimum trigger pull requirements and selector lever checks are met in accordance with
instructions in WP 0009.
11. Chips, flat spots, or bent striker points on firing pins will be cause for rejection.
12. The cartridge engaging surfaces on extractors must not be chipped or deformed.
13. Evidence of any damage to sights will be cause for a sight alignment check. Rear sight bases should
have no movement.
14. Rear sight elevating and windage mechanisms must operate with distinct clicks, without binding.
Sights must have sufficient tension to retain their setting during firing. Graduations and numerals
must be legible. Graduation filler is not required.
15. Safeties must positively position in both the ON and OFF position. When in the ON or safe position,
the rifle must not fire when the trigger is squeezed; when in the OFF or fire position, the rifle must fire
when the trigger is squeezed.
16. All locking devices such as latches, magazine latches, or detents must be positive in action and must
not become disengaged due to normal handling and firing. Retaining pins and similar devices must not
be subject to accidental loss during use or transportation.
17. Each rifle must be hand functioned to check for unusual binding, positive cocking action, and general
operation. Dummy ammunition must be used to assure positive feeding, chambering, extraction, and
ejection action.
Table 1. 5.56mm Rifle M16A2/M16A3/M16A4, M4/M4A1 Carbine.
Item Standard
RIFLE:
General .................................... Clear rifle of any ammunition and inspect in accordance with General
Inspection Criteria.
Barrel and barrel extension ... Check barrel erosion. Use barrel erosion gage 8448496 for chrome lined
barrels. Stripping of lands and grooves shall not be cause for rejection
unless so determined by barrel erosion gage.
Visually inspect, using chamber reflector tool 8448201.
Pits 1/8 in. (0.31 cm) in length and those pits large enough to extend from the
body of the chamber into the shoulder stop area and forcing cone area are
cause for rejection. Large pits are defined as 1/8 in. (0.31 cm) or more in
diameter as determined by visual inspection. Only closed flash suppressors
are acceptable.
Check barrel for straightness using bore straightness gage 8448202. Gage
must pass freely through the bore to be acceptable, either dropped from the
muzzle or chamber end.