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MIL-R-63997B(AR)
3.3.4.4.2  Ejector.
The  ejector  shall  be  retained  in  the  bolt
by the ejector pin and shall be held in the forward position by
the  ejector  spring.
The  ejector  shall  move  through  its  full  range
of  travel  under  spring  action  without  binding  in  the  bolt  and
shall  eject  cartridge  cases  completely  out  of  the  rifle  when  the
rifle  is  function  fired  or  manually  operated.
When fully
depressed, the ejector pin shall be flush with or below the
cartridge  seat  in  the  bolt.
3.3.4.4.3  Cam  pin.
The cam pin shall be retained in the bolt
assembly by the firing pin.
The cam pin shall move through its
full  range  of  travel  in  the  bolt  carrier  without  binding.
The cam
pin shall be capable of being removed from the bolt carrier
without removal of the bolt carrier key assembly.
T h e cam pin
shall be capable of being disassembled from the bolt and bolt
carrier assembly and reassembled 1800 about its vertical axis
from  its  original  position  without  causing  binding  in  the  assembly.
3.4
Performance
characteristics.
3.4.1 Head space.
The head space shall not be less than
1.4646 inches nor more than 1.4706 inches when measured to the
.330  inch  datum  diameter  on  the  first  shoulder  of  the  chamber.
Testing  shall  be  as  specified  in  4.5.3.1,  TABLE  III.
3.4.2  Firing  pin  indent.
When the bolt is closed and the
firing  mechanism  is  released,  the  firing  pin  indent  shall  be  not
less than 0.020 inch.
The firing pin indent shall not be
off-center more than one half the maximum diameter of the indent.
When,  in  a  vertical,  muzzle  down  position,  the  bolt  carrier
assembly is released from the full recoil position and the firing
mechanism is not actuated, the firing pin indent shall not be more
that 0.008 inch.
Testing shall be as specified in 4.5.3.1, TABLE
IV.
3.4.3  Trigger  pull.
The trigger pull shall be free of creep
and shall be within the range of 5.5 to 9.5 pounds.
Creep  shall
be interpreted to mean any perceptible rough movement between the
time the trigger slack is taken up and the hammer is released.
After  partial  or  completed  trigger  pull,  the  trigger  shall  return
to  its  normal  forward  position  (cocked  and  uncocked)  under  spring
action.
Testing shall be specified in 4.5.3.1, TABLE III.
3.4.4  Hiqh  pressure  resistance.
Each barrel assembly and
bolt  shall  withstand  the  firing  of  one  Government  standard  M197,
5.56mm high pressure test cartridge conforming to MIL-C-46936.
After  proof  firing,  parts  shall  be  free  of  cracks,  seams  and  other
injurious defects as evidenced by visual and magnetic particle
inspection.
Testing shall be specified in 4.5.3.1, TABLE III.
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