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MIL-R-63997B(AR)
4 . 7 . 4 . 4 P r o o f  m a r k i n g s .  Proof marks and magnetic particle
inspection  marks  shall be applied on barrel assemblies and bolts
that  have  passed  this t e s t .
4 . 7 . 5  Function  firing  test. This test shall be performed
during individual rifle testing in accordance with TABLE III, and
shall be accomplished with the rifles held in a Government
approved firing stand simulating shoulder firing. The ammunition
used on this test shall be as specified in 3.4.5, except that the
ammunitionused in semi-automatic firing shall be as specified in
3.4.6.
The  rifles  shall  be  prepared  for  firing
4.7.5.1 Lubrication.
using lubricant in accordance with MIL-L-63460 (CLP). Apply a.
light  coat  of  oil  to  all  surfaces  of  the  bolt  carrier  group.
Apply one drop of oil in each hole on the right side of the bolt
( D o not
carrier and in the open end of the bolt carrier key.
Apply a
apply  excessive  oil  in  the  bolt  firing  pin  recess.)
moderate coat of oil on all firing mechanism components in lower
receiver.
P r e - f i r i n g . T h e rifle  shall  be  given
a
pre-firing
4.7.5.2
examination to assure that no safety hazard exists.
4 . 7 . 5 . 3 F i r i n q  p r o c e d u r e . The  selector  lever  of  the  rifle
shall be set in "SAFE" position and shall be checked to assure
that  the  rifle  cannot  be  fired.
The  selector  lever  shallbe  set  on
4.7.5.3.1 Burst  firing.
The  rifle  shall  be  fired  using  a  fully
"BURST" for burst firing.
loaded 30 round magazine by pulling the trigger and holding
The  first  trigger  pull  shall  fire
rearward  until  it  stops  firing.
Each  successive  trigger  pull  shall  fire
one, two or three rounds.
three (3) rounds as long as the trigger is held fully rearward
T h e last trigger pull when
during  the  entire  three  round  burst.
the magazine is emptied shall be a one two or three round burst.
Failure  of  the  rifle  to  produce  a  three  round  burst  on  any  trigger
pull other than the first or last shall be cause for rejection and
recorded as malfunction.
4 . 7 . 5 . 3 . 2 Cyclic  rate  of  fire. When  rifles  are  required  to
tested  for  cyclic  rate  of  fire,  this  test  shall  be  conducted  in
conjunction  with  the  burst  firing  test  of  4.7.5.3.1.  The  cyclic
rate of fire measurement shall be taken on a three round burst,
ocuring on the fourth or fifth trigger pull when using a 30 round
magazine,  while  the  selector  lever  is  set  on  "BURST".  The  cyclic
r a t e of fire shall be measured using a Government approved timing
g a g e and shall be recorded.
4 . 7 . 5 . 3 . 3  Semi-automatic  firing.
The selector lever shall be
T e n rounds shall be
for  semi-automatic  firing.
s e t o n "SEMI"
-automatic
firing
shall
be
accomplished
fired.
The semi
simultaneouslly  with  the  target  and  accuracy  test  specified  in
37

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