PS Magazine - TB 43-PS-625

PS, The Preventative Maintenance Monthly

ISSUE 625

DECEMBER 2004
PS Magazine - TB 43-PS-625 - Page 3 of 33
T
o improve the reliability of the M4/M4A1 carbine, the Army has gone to a new
extractor spring assembly for the carbine's breech bolt assembly, whose NSN is now
1005-01-505-1035 because of the new extractor spring.
The new extractor spring
assembly comes with NSN
1005-01-505-2886. It's gold
colored with a black insert
and will be added to TM 9-
1005-319-23&P in Change 8.
All M4/M4A1s should
have the new extractor spring
assemblies installed by June
2005.
The M16-series rifle will
continue to use the extractor
spring assembly that comes
and is dark and has a black
insert.
PS 625
DEC 04
2
M16-Series Rifle, M4/M4A1 Carbine…
Dented Primer OK
Dear Half-Mast,
Here in Iraq we've
noticed that when
we chamber
-but
not fire
-rounds in
our M16-series
rifles or M4/M4A1
carbines, it dents
the round's primer.
Is there something
wrong with our
weapons or is this
normal?
SGT P.S.
Dear Sergeant P.S.,
It is normal for the round's primer to be dented
when the round is chambered. The dent is about
.007 inch deep, which isn't deep enough to set off
the round. Y
ou can charge and chamber a round
five times before you risk a deadened round that
won't fire.
It is a good idea when you're in a com-
bat situation like Iraq to rotate a chambered
round to the bottom of the magazine when you
clean your weapon and the magazine each day.
No use taking any chances.
Lemme
ask you
this…
is it OK to
keep chambering
the same round
day after day?
Won’t that
dent the
round
eventually?
I’ll start
doing
that
then.
Yeah, that’s why
you're supposed to
rotate the rounds in
the magazine
every
day
to prevent
firing problems.
PS 625
DEC 04
3
M4/M4A1 Carbine…
Correct
M4/M4A1
extractor
spring is
gold with a
black
insert
Questions?
Contact TACOM's
Kevin Moore at
DSN
7
93-2359/(309)
7
82-2359 or email:
moorek@ria.army.mil
For more info, see
TACOM maintenance
advisory message
MAM-04-024.
I keep
double
feeding.
it’s so
embarrassing!
is there
anything
you can do?
hmm… let’s
check your
extractor
spring.
you may
have the
old
one.
625.02-03(C!)
11/2/04
11:05 AM
Page 1
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