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|  MIL-S-3443G (AR)
3.16 Balance. The center of balance of the shotgun without
the bayonet band assembly shall be 4 to 7 inches forward of the
trigger.
3.17
Performance
characteristics.
3.17.1 Trigger pull. The trigger pull of each shotgun
shall be within the range specified in Table I.
3.17.2 Hiqh-pressure resistance and headspace. Each
shotgun shall withstand the firing of one high-pressure cartridge
containing the Sporting Arms and Ammunition Manufacturer's
Institute (SAAMI) standard proof load of 170 to 190 Copper Units
of Pressure (CUP) with no evidence of cracks, seams and other
injurious defects. After proof firing, the headspace shall be
0.0576 inch minimum to .0666 inch maximum. Headspace readings
shall be taken from the bolt face forward to an 0.850 inch datum
diameter.
Each shotgun shall cycle one magazine
3.17.3 Functioning.
full of dummy shells and shall fire five rounds of shells using
standard velocity commercial 12-gauge, 2 3/4-inch, 00 buckshot (9
pellets) maximum load cartridges conforming to SAAMI standards,
without malfunctions, unserviceable parts, punctured or ruptured
primers or shell cases, loose stock or screws or other unaccept-
able conditions. Malfunctions not attributed to the shotgun, as
established by a contractor failure analysis, and agreed to by
the Government representative, shall not be counted against the
shotgun being tested. However, such malfunctions shall be
When a shell is fired and the action slide handle or
recorded.
fore-end is not held, the breech bolt may move rearward to the
extent that ejection occurs. However, ejection shall not equal
or exceed in force that experienced under rapid or forceful
manual ejection. There shall be no bulged, split or rim cut
cartridge cases, or injury to the weapon (i.e., damage to
extractor, ejector, etc.) . Type I shotguns shall include M7
bayonet and scabbard as specified in 3.3.l.a.
At a range of 40
3.17.4 Tarqeting and accuracy (pattern).
yards ( one foot) aim shall be taken at the center of a pattern
sheet not less than 40 nor more than 60 inches square. The shot
pattern shall be such that not less than 33 1/3 percent of the
shot pellets shall be within or cut the edge of a 30-inch
diameter circle for accuracy (pattern), drawn entirely on the
pattern sheet so as to enclose the most shot. Five patterns
shall be fired from each gun and the average must be as
The guns shall be hand held during firing, or mounted
specified.
in a fixture that simulates hand firing. Ammunition shall be as
specified in 3.17.3.
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