MIL-DTL-48623A (AR)
Table V. Function and casualty firing defect criteria
DRAWING NUMBER
CARTRIDGE, CALIBER .50, BLANK,
9326760
M1A1
Criteria 1/
Classification
Defect Description
First Article
Lot Acceptance
First
Cumulative
Acc
Rej
Sample
Sample
Misfire
0
1
1
2
Major
Primer leak:
a. Escape of gas through primer cup
5
6
6
13
Minor
other than 3d
b. Blown primer on retraction of bolt
0
1
0
1
Minor
(Primer separates from casehead and
primer pocket is grossly distorted)
c. Dropped primer on retraction of bolt
0
1
0
1
Minor
(Primer falls out of pocket upon
retraction of bolt)
d. Perforation in firing pin indent in
17
18
18
45
Major
primer cup, machine guns
e. Escape of gas around primer cup
11
12
12
25
Major
more than 50% of periphery
Case casualties 3/ 4/
a. Longitudinal split
(1) Upper body (J)
6
7
7
15
Major
(2) Body (K) extending to case base
0
1
1
2
Major
(3) To head (L)
0
1
0
1
Major
(4) Through head (M)
0
1
0
1
Major
(5) Neck or shoulder (I or S)
26
27
27
65
Major
b. Circumferential rupture
(1) Partial neck, shoulder, or body
1
2
2
4
Major
(S, J, or K)
(2) Partial, head (L)
0
1
0
1
Major
(3) Complete
0
1
0
1
Major
Weapon stoppage attributable to
0
1
0
1
Major
Ammunition 2/
12
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