MIL-DTL-45500E
be assembled into production guns shall be proof fired as part of
the completed guns, inspected and proof marked in accordance with
applicable drawings. Barrels and breech bolt assemblies to be
used as repair parts shall be proof firing independently of
production guns and inspected and proof marked in accordance with
applicable drawings. After proof firing, the guns shall be
examined for cracks, deformation or other evidence of damage.
Cartridge cases shall be visually examined for bulges, splits,
rings, and other defects caused by defective barrels. All parts,
shall be reassembled to the guns from which they were removed and
proof marked in accordance with the applicable drawings.
4.6.4 Functioning test. Unless otherwise specified, guns
shall be tested held in mounts in accordance with 4.5.5.3 and
using the power supply and control equipment specified in 4.5.5.4
and applicable specification sheet.
4.6.4.1 Clearing test. Guns shall be function checked for
clearing action (see 3.4.4.1) using a 12 round belt of dummy
cartridges prior to the high-pressure resistance test (4.6.3).
The clearing action shall be checked by manually rotating the gun
to load five rounds in the gun, manually moving the clearing cam
sector assembly into clearing position, and clear the remainder
of the belt by manually rotating the gun. During clearing, the
clearing cam sector assembly shall be fully depressed to prevent
damage to the bolt shaft assemblies.
4.6.4.2 Function firing test. Guns shall be tested for
function firing using one six round belt for warm-up and to test
for proper functioning. A 75 or 100 round belt shall be fired to
test for acceleration, stopping time, cyclic rate of fire,
torque, targeting and accuracy, and functioning to determine
compliance with requirements of 3.4.5, 3.4.4, and Table I of the
applicable specification sheet. At the completion of firing, the
gun shall be checked to assure that all breech bolt assemblies
are in the cleared position.
4.6.4.3 Function firing test procedure. The function
firing test procedure shall be as specified on the applicable
specification sheet.
4.6.5
Targeting and accuracy test.
4.6.5.1 Procedure. Guns shall be tested with the gun held
in a mount in accordance with 4.5.5.3 and using a boresight in
accordance with Drawing C7797956, or Government approved test
equipment. The barrels shall be boresighted by inserting the
boresight in the muzzle end of the barrel when the gun is in each
of the three or six indexed positions. The boresight point of
the gun is then determined by the geometrical center of three
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