Technical data

TM 9-1005-319-23&P 0015
0015-23
M 1 6 A 1 R E J E C T M A R K
M 1 6 A 2 R E J E C T M A R K
3 0
1 v s 1 3 0
Figure 32. Use of Barrel Erosion Gage.
NOTE
When gaging barrel erosion prior to deployment of weapons, use the first mark
(M16A1 Reject Mark) as the preembarkation mark for the M16A2/M16A3/M16A4
Rifles and M4/M4A1 Carbines.
1. Install key and bolt carrier assembly with bolt assembly and firing pin removed. Hold weapon in
vertical position with receiver up. Insert barrel erosion gage PN 8448496 (30) into rear of upper
receiver assembly. The M16A2 reject mark must be read at rear edge of upper receiver assembly.
NOTE
The M16A2 reject mark will also be used when gaging M16A3/M16A4 rifles and
M4/M4A1 carbines.
2. If the M16A2 reject mark passes beyond rear surface of upper receiver assembly, the barrel is
unserviceable and shall be replaced.