PS Magazine - TB 43-PS-683

PS, The Preventative Maintenance Monthly

ISSUE 683

OCTOBER 2009
PS Magazine - TB 43-PS-683 - Page 13 of 33
22
PS 683
OCT 09
23
PS 683
OCT 09
M2
gunners should know that before they Fre their M2 machine guns they should
always
headspace and time the weapon Frst. If they don’t, they risk ruptured rounds and
damage to the barrel.
But headspacing and timing won’t do much good if you have a barrel with worn locking
grooves or a worn barrel locking spring. They will let the barrel turn during Fring and soon
you’ll have bad headspace.
It’s easy to check for worn locking grooves or a locking spring, though. When you’ve
Fnished headspacing and timing, let the bolt go all the way forward. Try to turn the barrel.
If it turns at all, either the barrel or locking spring is shot. Your armorer needs to check it
out. Never Fre an M2 whose barrel can be turned.
The M7, NSN 1005-01-518-9037, can
be mounted in the forward or rear (over
the wheel wells) positions on the M998
cargo carrier, depending on the mission.
The M7 comes with a large mounting
plate to stop spent casings from building
up along the edges of the vehicle bed and
to provide additional blast protection
from below. Its column base is designed
to eliminate cracked support braces and
tripping hazards. And it has a depression
stop to prevent accidental Fring in the
cab area.
Machine Gun
Mounts…
M7 Pedestal
Great on
HMMWV
M2 Machine Gun…
The
Final
Headspacing Step
some units are
fabricating
machine gun
mounts for
their hmmwvs.
there’s no
need for that.
the army’s
m
7
pedestal
works
great on
the hmmwv
and the m19
7
mount fits
right on
the m
7
.
to protect the gunner,
you can also order
the gunner’s shield,
this mount’s
gonna be
great!
order the
m
7
. it’s
just what
I need!
to prevent
barrel wear,
remember to
pull the charging
handle back to
the
3
/8-in hole
in the receiver
before screwing
in the barrel.
if you repeatedly
force the barrel
on without
doing that, its
locking grooves
eventually will
wear off.
Try turning barrel with bolt forward
If barrel turns,
locking spring
or locking
grooves are
probably
worn out
Pull charging
handle back to
3
/
8
-in hole before
screwing in barrel
I’ve headspaced
and timed you… now
we’re ready for
some serious firing.
hold on, speedy.
my locking spring
is shot so I won’t
be able to keep
that headspace.
you should
have tried
to turn my
barrel.
683.22-23.indd
1-2
9/4/09
3:12:39 PM
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