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MIL-R-63997B(AR)
The
following
data
shall
be
re-
4.7.7.3.3
Recording
of
data.
corded:
Inspection lot number.
a.
Rifle serial numbers.
b.
All measurements required for headspace, firing pin
c.
indent,  trigger  pull,  functioning  and  accuracy
requirements  before  and  after  interchange  of  parts.
Cyclic rate of fire before and after interchange of
d.
parts.
Failure  of  any  part  to  interchange.
e.
Any damaged part that was replaced.
f.
The endurance test shall be performed
4.7.8  Endurance  test.
Rifles
during inspection lot testing in accordance with TABLE IV.
shall be held in a Government approved firing stand using a
Government approved timing gage for measurement of cyclic rate of
The ammunition used for this test shall be as specified in
fire.
3.4.7.
4 . 7 . 8 . 1 C l e a n i n q  a n d  l u b r i c a t i o n Rifles shall be
lubricated-as  specified  below  at  the  beginning  of  the  test  and
a f t e r the fifth cycle in every 10 cycle increment. Rifles shall
b e cleaned and lubricated at the end of every 10 cycles. No other
cleaning  and  lubrication  shall  be  performed  during  this  test.  At
the close of each day's firing, the rifle shall be protected
against  corrosion.
Rifles  shall  have  been  lubricated
4.7.8.1.1  Lubrication.
using lubricant in accordance with MIL-L-63460 (CLP). Apply a
l i g h t  c o a t  o f  o i l  t o  a l l  s u r f a c e s  o f t h e bolt carrier group. (Do
not apply excessive oil in the bolt firing pin recess.) Apply a
moderate coat of oil on all firing mechanism components in lower
receiver.
Rifles shall be cleaned with a cleaning
4.7.8.1.2  Cleaning.
solvent  in  accordance  with  MIL-C-372  and  the  following  procedures:
- a r r e l . Brush bore thoroughly with a brush soaked in
B
a.
Brush the bore from the chamber
cleaning solvent.
to  the  muzzle  using  straight  through  strokes.  Do
not reverse direction of brush until it extends be-
Continue  brushing  until  the  bore
yond the muzzle.
Dry the bore by pushing
is covered with solvent.
Continue until
clean dry swabs through the bore.
Clean  dry
the swab comes out clean and dry.
compressed air may be used for preliminary drying.
47

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