MIL-DTL-63997C
3.4.11.2 Takedown pin retention in extreme in position. The takedown pivot pin shall be
securely retained in the extreme in position by spring action of the detent.
3.4.11.3 Takedown pin retention in extreme out position. The takedown pin shall be
securely retained in the extreme out position by spring action of the detent.
3.4.12 Pistol grip.
3.4.12.1 Pistol grip retention. The pistol grip shall be securely retained on the lower
receiver.
3.4.12.2 Pistol grip position. The pistol grip shall not interfere with operation of the
selector lever.
3.4.13 Buttstock assembly.
3.4.13.1 Buttstock assembly retention. The buttstock assembly shall be fastened securely
to the lower receiver, so that a gap of no more than 1/32 in. is present between the two. The
buttstock assembly shall not rotate on the lower receiver extension. No forward or rearward
motion of the buttstock, relative to the lower receiver, shall be allowed.
3.4.13.2 Buttstock component retention. The swivel, door assembly, and butt plate
assembly shall be securely fastened to the buttstock.
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 from lower receiver. 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 must
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
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