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.
chamber with cleaning swabs.
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
B o l t c a r r i e r group.
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.
Clean with cleaning solvent and
remove all powder fouling. Clean the protruding gas
tube using a bore brush attached to a section of the
Saturate the brush with cleaning
(Do not use any type of abrasive material
to clean the gas tube.
Remove excess cleaning
Lower receiver. Remove all carbon residue from lower
receiver group assembly using cleaning solvent.
Drain excess solvent from lower receiver cavity and
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
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
The following measurements shall be
made during this test:
Headspace for rifles being fired with 30
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