MIL-DTL-12779D
Table VI. Function and casualty firing defects criteria.
Defects 5/
First Article
Lot Acceptance
Classification
Acc
Rej
First
Cumulative
Sample
Sample
1. Misfire 4/
a. No vent hole, or obstruction
in vent hole 1/
0
1
0
-
Major
b. Other
0
1
0
1
Major
2. Primer defects
a. Perforation in firing pin
0
1
0
-
Major
indent in primer cup 1/
b. Escape of gas around
1
2
2
3
Major
primer cup 2/
c. Primer remains in pocket
0
1
0
-
Major
but is physically loose 1/
d. Blown primer 1/
0
1
0
-
Major
e. Primer falls out of pocket
0
1
0
-
Major
on extraction 1/
3. Case casualties
a. Longitudinal split 3/
1. Mouth or body (I or J)
1
2
2
3
Major
2. Body (K) 1/
0
1
0
-
Major
3. To head (L) 1/
0
1
0
-
Major
4. Through head (M) 1/
0
1
0
-
Major
b. Circumferential rupture 3/
1. Partial (J)
0
1
0
1
Major
2. Partial, body (K)
0
1
0
1
Major
3. Partial, head (L) 1/
0
1
0
-
Major
4. Complete 1/
0
1
0
-
Major
4. Failure to extract
0
1
0
1
Major
5. Weapon stoppage 6/
0
1
0
1
Major
Notes:
1/ No second sample permitted. Lot shall be rejected if one or more failure occurs.
2/ Gas escapes around more than fifty percent of periphery of cup.
3/ For location of defects indicated by letters in parentheses, see dwg. 7643674.
4/ Each cartridge that misfires shall be disassembled and examined for presence of vent hole in
primer pocket or any obstruction, in the vent hole area of primer pocket that can be assignable as
the cause for misfire. If vent hole is missing or obstructed, the lot shall be rejected with no
second sample permitted.
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