PS Magazine - TB 43-PS-626
PS, The Preventative Maintenance Monthly
ISSUE 626
JANUARY 2005
one hole
or lower!
that’ll keep
us
both
happy!
PS 626
JAN 05
15
Machine Gun Mounts…
L
ow is the way to go while firing
the MK19 machine gun on the
M6 pedestal.
When the M6 is set any higher
than one hole exposed, it can
interfere with the recoil of the
MK19, especially in the cold. So
set the M6 at one hole exposed or
lower to fire the MK19.
In very cold weather (-50° F or
below), fire the M2 machine gun
on the M6 no higher than one
hole exposed. The M6 can also
interfere with M2 recoil, but only
in extreme cold.
Machine Guns…
t
errible things happen when you fire
and fire your machine gun without
switching barrels. The barrel becomes
VERY HOT, which can cause:
That's why the M2, M240, and M249 machine guns come with a spare barrel and
why it's important you keep track of rounds fired and rate of fire. Take the spare to
the field and change barrels when your machine gun needs it.
M2 Limits Changed
The rule on when you change the M2
machine gun's barrel has changed. The
old rule was that you changed the M2
barrel at the end of a day of firing no
matter how many rounds were fired. No
more. If you're firing single shot, you
can still wait until the end of the day to
change barrels. But if you're firing slow
fire (40 or fewer rounds per minute),
change the barrel every hour and if
you're firing rapid fire (200 rounds per
minute), change it every 1/2 hour.
Other Machine Gun Limits
For the M240, change the
barrel every 10 minutes during
sustained fire (100 rounds per
minute) and every two minutes
during rapid fire (200 rounds
per minute).
For the M249, during both
sustained fire (40 rounds per
minute) and rapid fire (100
rounds per minute), change the
barrel every 200 rounds.
Change the barrel even more
frequently on hot days. Heat
heats up the barrel quicker. And
remember blanks heat up a bar-
rel just as much as live rounds.
speaking
of changes,
the firing
limit for m2
barrels has
changed.
I’m
burning
up
and I
haven’t even
fired a round
yet!!
you gotta
change it!!
•
a cookoff
•
a warped barrel
•
a worn-out bolt and barrel
•
ruined headspacing, which can cause the
machine gun to explode during firing
don't spare the spare barrel
hey!
you
know
you’re
s’posed to
change my
barrel more
often now…
don’t you?
enough already!
are you trying to
ruin
my barrel?
626.14-15(C!)
11/21/04
6:13 PM
Page 1
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