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MIL-R-63997B(AR)
is in the burst position, the burst disconnect shall engage and
restrain the hammer in the cocked position every third shot until
When the trigger is released the
the  trigger  is  released.
disconnect shall allow the hammer to return to the normal cocked
position.
The trigger shall hold the hammer in the
3.3.2.7  Trigger.
After  partial  O K
cocked  position  until  the  trigger  is  pulled.
completed  trigger  pull,  the  trigger  shall  return  to  its  normal
forward positions (cocked and uncocked) under spring action.
The trigger guard shall pivot on the
3 . 3 . 2 . 8  T r i g g e r guard.
The  trigger
trigger  guard  pin  through  its  full  range  of  travel.
guard  shall  be  retained  in  the  closed  position  by  the  trigger
guard spring loaded detent, and when in the open position it shall
remain open against the pistol grip without manual assistance.
The  pivot  pin  and
3 . 3 . 2 . 9  P i v o t Pin and takedown Pin.
takedown  pin  shall  move  through  their  full  range  of  travel  without
binding,  and  shall  be  retained  in  the  extreme  in-and-out  position
by  spring  action  of  the  detents.
The pistol grip shall be securely
3.3.2.10  Pistol grip.
attached  to  the  lower  receiver  and  shall  not  interfere  with
operation  of  the  selector  lever.
3.3.2.11 Buttstock assembly. The buttstock assembly,
stowage, shall be fastened securely to the lower receiver and
The swivel,
shall  not  rotate  on  the  lower  receiver  extension.
door assembly and butt plate assembly shall be securely fastened
The door assembly shall be capable of being
to  the  buttstock.
manually  unlatched,  and  when  unlatched  the  door  assembly  shall
operate  through  its  full  range  of  travel  without  binding.
The  buffer  assembly  shall  function
3.3.2.12  Buffer  assembly.
through its full range of travel under spring action without
The buffer assembly shall be securely retained in the
binding.
lower receiver assembly by the spring loaded buffer retainer and
be capable of being disassembled from the lower receiver assembly
when the retained is manually depressed
receiver group.
3.3.3
Upper
The  barrel  shall  be  free  of  cracks,
3.3.3.1  Barrel  assembly.
seams and other 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
Burrs and sharp edges shall be removed from chamber edges,
steel.
Scratches or marks occurring in a chamber
and bolt locking lugs.
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.
5

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