MIL-DTL-71186A
positions. Release of the lever when the buttstock is positioned in the extended or retracted
position shall allow the lock pin to secure the buttstock in that position.
3.4.13.3 Buttstock assembly removal. Pulling the rear end of the release lever away from
the buttstock shall allow the buttstock to slide rearward off the lower receiver extension.
3.4.14 Buffer assembly.
3.4.14.1 Buffer assembly motion. The buffer assembly shall move between its retained
position and its fully compressed position without binding. Movement from compressed to
retained shall be under spring action.
3.4.14.2 Buffer assembly retention. The buffer assembly shall be securely retained in the
lower receiver assembly by the spring loaded buffer retainer.
3.4.14.3 Buffer assembly disassembly removal. The buffer assembly shall be capable of
being disassembled from the lower receiver assembly when the spring loaded buffer retainer is
manually depressed.
3.5 Upper receiver assembly.
3.5.1 Barrel assembly.
3.5.1.1 Barrel assembly straightness. The barrel assembly shall be straight to the extent
that a cylindrical plug with a diameter of .2173 + .0001 inches, and six (6) inches in length shall
drop through the barrel bore, both directions, of its own weight.
3.5.1.2 Barrel assembly angular deviation. The barrel shall have a maximum angular
deviation of zero degrees and three minutes (0° 3') from the axial centerline of the barrel.
3.5.2 Gas tube.
3.5.2.1 Gas tube retention. The gas tube shall be securely retained to the front sight
assembly by the gas tube spring pin.
3.5.2.2 Gas tube alignment. The gas tube shall be positioned for proper alignment with
the bolt carrier key. Proper alignment shall allow for the gas tube to freely move in and out of
the bolt carrier key without binding.
3.5.3 Rail cover.
3.5.3.1 Rail cover mounting. The rail covers shall be capable of being disassembled from
and assembled to the rail adapter system by applying thumb pressure to the retaining clip and
sliding rail covers onto the rail adapter system until the retaining clip automatically engages.
The retaining clips shall only engage with the two end recoil slots.
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