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MIL-R-63997B(AR)
Barrel chamber.
b.
Insert the cleaning rod section and
chamber brush that has been dipped in cleaning
solvent  into  the  chamber  and  use  reciprocating
plunge  strokes  and  rotational  3600  motions.
Dry
chamber with cleaning swabs.
Barrel extension.
c.
Using a small bristle brush that
has been dipped in cleaning solvent, clean the
locking  lugs  in  the  barrel  extension.
R e m o v e excess
cleaning  solvent.
B o l t  c a r r i e r group.
d.
With the exception of the bolt
carrier  key,  bolt  rings,  extractor  spring  and  the
ejector,  disassemble  all  parts,  wash  these  parts  in
cleaning  solvent  and  remove  all  carbon  deposits.
Particular attention should be given to the areas
under the face of the extractor and behind the three
rings  on  the  bolt.
Clean the bolt carrier key hole
with a worn bore brush that has been dipped in
cleaning solvent by rotating the brush clockwise
(repeat several times until clean). Remove excess
solvent  and  dry.
.
Upper  receiver.
e.
Clean  with  cleaning  solvent  and
remove all powder fouling. Clean the protruding gas
tube using a bore brush attached to a section of the
cleaning  rod.
Saturate the brush with cleaning
solvent.
(Do not use any type of abrasive material
to clean the gas tube.
Remove excess cleaning
solvent.)
Lower receiver. Remove all carbon residue from lower
f.
receiver  group  assembly  using  cleaning  solvent.
Drain  excess  solvent  from  lower  receiver  cavity  and
dry.
The twenty (20) 30 round magazines used
4 . 7 . 8 . 2  Magazine.
i n  e a c h  r i f l e shall be numbered and used in rotation during this
Each -
test.
Magazines shall be fully loaded for each use.
magazine used during this test shall be cleaned at the specified
cleaning  interval  for  the  rifle  with  a  cleaning  solvent  in
accordance with MIL-C-372 and blown dry with prepared compressed
air.
The following measurements shall be
4.7.8.3  Measurements.
made during this test:
Headspace for rifles being fired with 30
Headspace.
a.
round magazines shall be measured and recorded at
the beginning of the test and at the completion of
After  the  50th  cycle,  the  headspace
the 50th cycle.
shall not be more than .0028 inch greater than the
initial measurement and shall not exceed .0024 inch
over maximum.
48

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