PS Magazine - TB 43-PS-670

PS, The Preventative Maintenance Monthly

ISSUE 670

SEPTEMBER 2008
PS Magazine - TB 43-PS-670 - Page 13 of 33
22
PS 670
SEP 08
23
PS 670
SEP 08
New M68 Sight TM Available
The M68 reflex sight has a new TM. TM 9-1420-413-13&P replaces TM 9-1420-413-12&P.
The -13&P includes changes for the M68 Comp M2, NSN 1240-01-411-1265, and provides
new maintenance and parts info for the M68 Comp M4, NSN 1240-01-540-3690. The TM is
available at the ETM site:
Your pubs clerk can order you a paper copy.
The screws are self-locking, so once
they’re tightened snug the forward rails
should be tight. If you continue to tighten
the screws, you strip or break them.
If the rails aren’t tight, armorers,
remove the screws and the forward
rails. Check the receiver holes where
the forward rails’ studs go. If the holes
are out-of-round, the M249 needs to be
turned in because you will never be able
to securely mount the forward rails to
the receiver.
Out-of-round holes are usually caused by your repairman mistakenly thinking the
forward rails don’t Ft. So he enlarges the holes. That makes it impossible to keep the
forward rails tight.
If the studs don’t Ft into the holes easily, your repairman should use a rubber
mallet to tap the forward rails into place. That should do the trick. Enlarging the holes
accomplishes nothing but ruining the receiver.
Dear Half-Mast,
We read in PS 661 (Dec 07) about the new sling adapter for the M249
machine gun. Will the adapter replace the sling snap hooks as B
II
or are
they going to be considered AAL? And if they’re AAL, do units need to
keep the snap hooks?
SSG R.G.
Dear SSG R.G.,
Good question. The front mounting kit, NSN 1005-01-529-8406, and one quick-
release swivel, NSN 1005-01-529-9309, are now part of the standard conFguration.
They are repair parts, not BII or AAL. The rear mounting kit, NSN 1005-01-529-
8408, and the second quick-release swivel, NSN 1005-01-529-9309, are AAL.
These parts were designed to prevent wear where the sling attaches to the receiver.
Too much wear means the receiver must be coded out. If your M249, though, has the
standard buttstock, you don’t need the rear mounting kit, because the kit actually
costs more than the $15 buttplate. But if your M249 has the collapsible buttstock,
the rear mounting kit and swivel are a good buy if you’re attaching the sling to the
buffer assembly because the assembly costs $320 to replace.
Units do need to keep the snap hooks from the sling. You can use the sling as is
with the snap hooks attaching it to the swivels. If you wish to get away from the old
sling with the snap hooks, you can order the Bulldog Sling, NSN 1005-01-533-4093,
which has carabiner attaching hardware.
If you have questions about the M249, contact TACOM-RI’s
at DSN 793-1918, (309) 782-1918, or email:
matthew.williams22
@us.army.mil
M249 Machine Gun…
Sling
Adapter
BII or
AAL?
M249 Machine Gun…
Snug is
Tight
Enough
say, this new sling swivel
adapter will sure stop the
sling hooks from cracking
your upper receiver holes.
but is all
this new
stuff bII
or aal?
tightening and tightening
the screws for the m249
machine gun’s forward
rails isn’t necessary.
Tighten forward
rail screws until
they are snug—
then stop
hey,
that’s
tight
enough.
if you keep strong
arming that screw,
you’ll break it!
670.22-23.indd
1-2
7/25/08
2:49:50 PM
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