PS Magazine - TB 43-PS-436
PS, The Preventative Maintenance Monthly
ISSUE 436
MARCH 1989
If you have the old firing pin springs
that are not crimped, remember they
can fAll oF the firing pin when you
take apart the bolt. Take o± the spring
and put it in your pants pocket so it
won't get lost²
Your armorer can solvE that problem
by
ordering
crimped
springs,
NSN
New firing pin
springs are crimped
and won't Fall o± pin
If you a³d your buddies clean your
M249's together, be care´l not to mix
bolts and barrels² They're headspaced
specifµcally ¶r each gun. · m¸x up
leads to a Ruined bolt ²². or an explod¹
ing gu³²
Put a ºw drops of CLP on the cock¹
ing handle lock pin during cleaning»
That keeps the cocking handle ¼om
hanging up²
A
Few drops of
CLP
on pIn helps
cockIng handle move
½asy does it when you put on or take
oF the ha³dguard² If you pound its pin
in or out, you break the receiver tab
that holds the handguard on. The re¹
ceiver's deadlined. Push the pin out or
in with the spring guide rod. If the pin
30
MaR 89
\
I
won't go in, check the alignment of
the holes. Clean and lube the pin to
help it slide better.
¾LP's fine ¶r yoUr barrel when it's
going back to the arms room. But it's
terrible ¶r firing. ·s the barrel heats
up, the lube smokes. CLP also takes
the ¿µnish oF a hot barrel, which leads
to corrosion. The bÀÁel should be com¹
pletely dry ¶r firing²
½ven if you've thoroughly clea³ed
your M249, it may need more cleaning
in the Âield. Carbon builds up in the
M±R 89
31
chamber and causes double feeding
and
cookoFs.
When
you
change
magazi³es after 200 roUnds, eyeball
the chamber ¶r carbon. If you spot
any, remove the barrel anD run the
chamber brush throUgh it.
Eyeball chaMber
for caRbo²
builduP wh³n
you cHange
barrels
BefOre you pUt on a new magazine,
ºel in the magazine well ¶r links or
brass² Pull out any you find. They will
cÃuse jaÄm¸ng.
´eeL in magazine
well FoR LInKs
Or brass
The barrel release latch spring wears
out fAst² If the bÅrel ever fAlls oF from
just a slight bump to the release latch,
the spring' s shot. Test release latch ten¹
sion during PMCS² It shouldn't move
easily² Tell your armorer if the spring's
weak.
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