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MIL-R-63997B(AR)
a.
Rifle  serial  number.
b.
Inspection  lot  number.
c.
Computed measurement of firing pin indent for both
firing mechanism released and not released.
4.7.3  Trigger pull  test.
This test shall be performed during
i n d i v i d u a l  r i f l e testing In accordance with TABLE III using
Government approved inspection equipment.
4.7.3.1  Minimum  load.
The rifle shall be cocked and the
selector  lever  placed  in  the  "SEMI"  position.
T h e minimum load
shall be gradually applied to the center of the trigger and
exerted in line parallel to the axis of the barrel bore.
To be
acceptable,  the  hammer  shall  not  release.
4.7.3.2 Maximum load.
The rifle shall be cocked and the
maximum load shall b e g r a d u a l l y a p p l i e d t o t h e c e n t e r o f t h e
trigger  as  before.
To be acceptable, the hammer shall release.
4.7.3.3  Creep.
The rifle shall also be manually tested to
assure  that  the  trigger  pull  is  free  of  creep  (see  3.4.3)  and  that
the  trigger  returns  under  spring  action  to  its  normal  forward
position  after  partial  or  complete  trigger  pull.
4.7.4  High-pressure  resistance  test.
This  test  shall  be
performed  during  individual  rifle  testing  in  accordance  with  TABLE
III, using a Government approved fixture for holding the bolt and
barrel  assembly.
4.7.4.1  Test  cartridge.
One  (1)  high-pressure  test  cartridge
(see 3.4.4) shall be fired in each bolt and barrel assembly.
Unless otherwise specified, the bolt and barrel assembly shall be
tested  concurrently.
After  proof  firing,  cartridge  cases  shall  be
examined for bulges, splits, rings and other defects caused by
defective  chambers  of  the  barrel  assembly.
4.7.4.2  Barrel  inspection.
The barrel assembly shall be
magnetic  particle  inspected  in  accordance  with  MIL-STD-1949
utilizing a current of 400 to 500 amperes for circular continuous
magnetization.
The barrel assembly shall be examined for evidence
of cracks, seams and other injurious defects.
4.7.4.3  Bolt  inspection.
The bolt shall be magnetic particle
i n s p e c t e d  i n  a c c o r d a n c e  w i t h M I L- S T D- 1 9 4 9  u t i l i z i n g  s t a n d a r d  f i v e
turn magnetizing coil with a currrent of 200 to 300 amperes.
Both
circular  and  longitudinal  continuous  magnetization  with  wet
fluorescent  solution  shall  be  used.
The bolts shall be examined
for evidence of cracks, seams and other injurious defects.
36

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