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MIL-R-63997B(AR)
4.7.1.2  Maximum
The  bolt  shall  then  be  retracted  to
t h e o p e n p o s i t i o n a n  t h e minimum headspace gage removed from the
The maximum headspace gage shall be inserted in the
chamber.
Only
chamber and the bolt returned to the battery position.
finger pressure shall be used to close the bolt.
To be acceptable
the bolt shall not fully close.
If  the  above  results  are  in
4.7.1.3 Dimensional inspection.
dispute, the rifle shall be disassembled and the 1.6206 + .0030
barrel dimension and the .156 - .003 bolt dimension shall be
measured to determine compliance with the drawing requirements.
4 . 7 . 2 F i r i n g pin  indent  test.
This test shall be performed
during inspection lot testing in accordance with TABLE IV
utilizing  Government  approved  chamber  adapters  and  Government
furnished  copper  compression  cylinders  for  insertion  in  the  barrel
chamber.
4 . 7 . 2 . 1  F i r i n g mechanism  indent.
The rifle shall be held in
(muzzle down) with the muzzle end supported.
a  vertical  position
The bolt shall be retracted to the rearward position and held
A zero indicator reading shall be made on the height of the
open.
copper pressure cylinder before insertion into the chamber
The chamber adapter containing the copper compression
adapter.
The bolt
cylinder  shall  then  be  inserted  in  the  barrel  chamber.
shall  be  manually  reeturned  to  the  battery  position,  the  trigger
shall be pulled to release the hammer and indent the copper
compressions  cylinder.
The chamber adapter shall be removed from
the barrel chamber and the depth of the indent on the copper
compression cylinder computed by measuring the distance from the
original  zero  indicator  reading  to  the  bottom  of  the  firing  pin
The indent impression shall be visually examined to
impression.
determine if the concentricity requirement has been met.
The bolt shall again be
4.7.2.2  Bolt  action  indent.
retracted to the open rearward position and held open. A zero
indicator reading shall be made on the height of the copper
compression cylinder before insertion into the chamber adapter.
The chamber adapter containing the copper compression cylinder
The bolt shall be
shall then be inserted in the barrel chamber.
The  trigger
returned to the battery position under spring action.
The chamber adapter shall be removed from
shall not be pulled.
the barrel chamber and the depth of the indent in the copper
compression cylinder computed by measuring the distance from the
original  zero  indicator  reading  to  the  bottom  of  the  firing  pin
impression.
The following data shall be
4.7.2.3
Recording
of
data.
recorded:
35

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