MIL-DTL-70599C
injurious defects and the bore and chamber shall be free of pockets, rings, bulges and other
deformations. The chromium plating in the chamber and bore shall be free of nodules, flaking,
pits, stripping, anode burns and evidence of etched base steel. Burrs and sharp edges shall be
removed from chamber edges, and bolt locking lugs. Scratches or marks occurring in a chamber
which otherwise meets the surface roughness requirements, shall be permitted, provided they do
not cause marks on the cartridge case of high pressure test cartridge fired in the chamber.
3.5.1.2 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 must
drop through the barrel bore, both directions, of its own weight.
3.5.1.3 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.
3.5.3.2 Rail cover retention. The rail covers shall be securely retained on the rail adapter
system by the retaining clip.
3.5.4 Vertical pistol grip.
3.5.4.1 Vertical pistol grip motion. When the lock assembly is unlocked, the vertical
pistol grip shall move freely along the rail adapter system without binding.
3.5.4.2 Vertical pistol grip retention. The vertical pistol grip shall be securely retained on
the rail adapter system by the lock assembly.
3.5.5 Front sight assembly.
3.5.5.1 Front sight assembly retention. The front sight assembly shall be securely retained
on the barrel assembly by two taper pins.
3.5.5.2 Front sight post retention. The front sight post shall be held in position by the
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