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MIL-M-70821 (AR)
Functional firing.
TABLE II.
Impulse Level
Recoil Mode
Simulated Elevation
Round Number
50%
0
Long
00
1
100%
Long
0
2
100%
Short
Max.
3
100%
Short
Max.0
4
100%
0
Long
5
NOTE :  Impulse applied to the recoil mechanism at 100% impulse
level is 6350 pound-second minimum for long recoil and 6800
pound -second minimum for short recoil.  At least one cycle in both
long and short mode shall meet or exceed the 100 % level.  The
recoi l oil pressure for long recoil and for short recoil should be
withi n the performance zones specified by figures 1 and 2 at the
100% level.
The first three mounts selected as
specified in
specified in Table III.  After the first three mounts, mounts
selectd shall be proof fired as specified in Table IV.
Recuperator nitrogen pressure shall be set at 700 25 psi at
ambient temperature prior to firing.  All measurements required by
3.4.3 shall be recorded for each firing: Observation shall be
made for erratic motion in counter-recoil.  During and after
firing, each mount shall be examined to determine compliance with
oil leakage requirements specified in 3.4.5 and nitrogen leakage
as specified in 3.4.6. .
TABLE III.  Proof firing (First article)
Recoil Mode
Elevation
Round Number
M4A2, Zone
6
0
00
Long
1
M203., Zone
8
Long
0
2
M203, Zone
8
Short
Max.
3
M203, Zone
8
Short
Ma0 ,
x
4
M203, Zone
8
Long
0
5
19

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