PS Magazine - TB 43-PS-609

PS, The Preventative Maintenance Monthly

ISSUE 609

AUGUST 2003
PS Magazine - TB 43-PS-609 - Page 13 of 33
PS 609
AUG 03
23
M68 Optical Sight…
Keeping It
Tight
M249 Machine Gun…
Mounting
the AN/PVS-4
Dear Editor,
We have had trouble keeping the M68 optical sight tight on our M16
rifles and M4 carbines. A loose sight makes accurate sighting difficult.
Armorers can keep the
mounting screws tight by
putting a drop of sealing
compound, NSN 8030-01-
014-5869, in each screw
hole before installing the
screws. Sealing compound
keeps the screws tight
without making it impossible
to remove the screws later.
CW2 Benjamin Stecker
HHC, 3/235th Airborne
Ft Bragg, NC
Dear Half-Mast,
How do I get the new
AN/PVS-4 night sight
mounting bracket for the
M249 machine gun?
LT B.M.
Dear Lieutenant,
Order an adapter, NSN
rail grabber assembly, NSN
also need two screws, NSN
5305-01-015-5686, to attach
the adapter to the AN/PVS-
4, and two screws, NSN
5305-00-928-9540, to attach
the rail grabber to the
adapter.
PS 609
AUG 03
22
M16A4 Rifle…
Put one drop
of sealing
compound in
each mounting
screw hole
there are
differences
with your
m16a4 and it’s
important to
know what
they are.
The 300-meter mark on the rear sight is 6/3,
not 8/3 like it is for the M16A2. And after you
reach the mechanical zero when you zero the
sights, you move the elevation knob clockwise
up two clicks past the 300-meter setting, not
one like you did with the M16A2. That's Step
4 on Page 0011 00-7 in TM 9-1005-319-10.
When you mount the M5 adapter rail
onto your M16A4 to replace the stan-
dard handguards, use the provided rail
covers to protect the bare rails from
rough treatment and your hands from
the hot barrel. The rail covers can be
arranged in any manner to cover
exposed metal areas that your optics
or other accessories don’t cover.
Leave the screw at the top rear part of
the adapter rail alone. It's a self-locking
screw that keeps the mounting rail in
place. Once it's removed, it's no longer
self-locking and it must be replaced.
Finally,
a way to
get us
together!
I’ve been
waiting
for this!
I’m glad
I could
help!
6/3
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