MIL-DTL-71186A
chamber edges, and barrel locking lugs. Scratches or marks occurring in a chamber which
otherwise meets the surface roughness requirements, shall be permitted.
3.6.7.5 Endurance bolt assembly integrity. After completion of the endurance
functioning test, the bolt of each weapon shall be free of cracks, seams and other injurious
defects. Burrs and sharp edges shall be removed from chamber edges, and bolt locking lugs.
3.6.7.6 Endurance headspace measurement. Headspace for weapons being fired with 30
round magazines shall be measured and recorded at the beginning of the test and at the
completion of the 50th cycle. After the 50th cycle, the headspace shall not be more than .0028
inch greater than the initial measurement and shall not exceed .0024 inch over maximum (1.4706
inches when measured to the 0.330 inches datum diameter on the first shoulder of the chamber).
3.6.7.7 Endurance bolt action indent. After completion of the endurance functioning test,
the bolt action indent shall be measured. The bolt is closed and the firing mechanism is released,
the firing pin indent shall not be less than 0.020 inches.
3.6.7.8 Endurance muzzle down position indent. After completion of the endurance
functioning test, the muzzle down position indent shall be measured. When in a muzzle down
position, the bolt carrier assembly shall be released from the full recoil position and the firing
mechanism shall not be actuated, the firing pin indent shall not be greater than 0.008 inches.
3.6.7.9 Endurance firing pin indent location. After completion of the endurance
functioning test, the firing pin indent location shall be measured. The firing pin indent shall not
be off-center more than one half the maximum diameter of the indent.
3.6.7.10 Endurance firing pin protrusion. After completion of the endurance functioning
test, the firing pin protrusion shall be measured. The firing pin protrusion shall not be greater
than 0.036 inches and shall not be less than 0.028 inches.
3.6.8 Interchangeability. All weapon parts shall be interchangeable, unless otherwise
specified, and shall comply with the requirements for headspace, firing pin indent, trigger pull,
function firing, cyclic rate of fire, and target and accuracy tests before and after interchange of
parts.
3.6.9 Unique Identification (UID). A UID label shall be firmly affixed to the lower
receiver assembly in accordance with drawing 12972652. Each weapon shall be identified by
a serial number which shall appear on both the side plate of the receiver assembly and on the
UID label. The UID label shall not negatively affect the receiver's protective finish and shall
withstand all requirements.
3.6.10 Workmanship. Workmanship shall be in accordance with the workmanship
requirements of MIL-W-13855 and MIL-W-63150. Finished items and parts shall not exhibit
poor material and processing such as seams, laps, laminations, cracks, visible steps, sharp edges,
nicks, scratches, burrs, deformations and missing operations which may affect serviceability,
functioning, operation, appearance or safety. Fins and other extraneous metal shall be removed
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