PS Magazine - TB 43-PS-700
PS, The Preventative Maintenance Monthly
ISSUE 700
MARCH 2011
23
PS 700
MAR 11
The wrench is used by the operator and
maintainer to install or remove the mounting
adaptors, the day/night sight mount, the forward
pistol grip and the leaf sight.
If you use a multi-purpose tool or a standard
hex-head wrench, you will strip out the socket
head screws for these parts. Support has to
replace them.
If you lose the hex-head wrench, order a new
one with NSN 5120-12-354-1599.
Learn all there is to know about the M320 and
M320A1 by reading TM 9-1010-232-23&P.
Y
our M16-series rife or M4/M4A1 carbine will stay on target iF you target this PM:
A good test oF the bolt’s gas rings is to turn the
bolt carrier upside down. IF the bolt slides out oF the
carrier, the gas rings may need to be replaced. IF it
doesn’t, the gas rings are still good.
But some units are testing the gas rings by setting
the bolt carrier down bolt ±rst on a table with the
bolt extended. IF the carrier slides down on the bolt,
they think the gas rings are bad. That may not be
true. The carrier’s weight can cause the carrier to
slide down, even iF the gas rings are good.
It’s also a good idea to check For a loose barrel, especially with the M4/M4A1.
It’s easy to check to see iF your barrel is loose. Hold the receiver ±rmly with
one hand and try to twist the barrel back and Forth with the other. IF there’s any
movement, tell your maintenance personnel. Your rife won’t be accurate.
Don’t Hex M320 with
Wrong Hex Head
M16-Series Rifle,
M4/M4A1 Carbine…
Target This
Rifle PM
Remember
that the gas
ring gaps
must
be
staggered!
if the
gaps line
up, too
much gas
escapes
and you’ll
get poor
recoil.
Stagger bolt ring gaps
Keep
hex head wrench
here. And use it!
NOW
tHAT’S
THE
idea!
the new m320
is metric.
it comes with a metric hex-head
wrench that’s stowed in the receiver
for a very good reason:
you’re
supposed to use it!
Try to turn
barrel to
check for
looseness
M320
Grenade
Launcher…
If bolt
falls
out of
carrier,
gas rings
could be
bad
700.22-23.indd
1-2
1/28/11
5:36 PM
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