PS Magazine - TB 43-PS-620
PS, The Preventative Maintenance Monthly
ISSUE 620
JULY 2004
Dear Editor,
Riflemen and armorers are supposed to
check that their M16s and M4/M4A1s
don't have any play in the barrel. If the
barrel is loose at all, the weapon shouldn't
be fired.
The problem is that soldiers often hold
the buttstock with one hand while twisting
the barrel with the other. The buttstock
may have some slight side-to-side move-
ment, which is OK. But sometimes they
mistakenly think it's the barrel, not the
buttstock, that's loose, and they think
they have a problem.
Avoid that mistake by holding the carry-
ing handle with one hand and gripping the
barrel around the front sight with the
other. First make sure the carrying handle
is tight if you have an M16A4 or
M4/M4A1. Gently twist the barrel in both
directions. If you feel any movement, send
the gun to direct support.
T
o mount the
AN/PVS-4 night
sight on your
M240B or M249
machine
gun,
you
use
the
adapter and rail
grabber assem-
bly. Here are the
parts you'll need:
Don Whetstone
James Fletcher
Ray Johnson
Raytheon
Ft Bliss, TX
PS 620
JUL 04
17
Mounting AN/PVS-4 on Machine Guns
1.
Remove the two screws for the the sight's metal adapter with a
5/32-in hex key. Take off the adapter and store it and the screws in
a sealed plastic bag in the sight's case.
2.
Position the adapter/rail grabber assembly so that the rail grab-
ber fits on the front portion of the night sight. Align the two holes
in the adapter with the two holes in the bottom of the night sight
and secure the adapter with the two screws, NSN 5305-01-015-
5686. Tighten them snug with a 5/32-in hex key.
3.
Position the rail grabber assembly knob on the left side of the
machine gun. Turn the knob counterclockwise to loosen it and then
attach the rail grabber assembly to the gun's top rail. Turn the knob
clockwise until it extends and clicks a few times. You're done.
PS 620
JUL 04
M16-Series Rifle, M4/M4A1 Carbine…
Tighten Up
Loose
Barrel
Check
(Editor’s note:
I
think you've got a
good grip on that
problem. Thanks.)
Hold by
carrying
handle
and grip
barrel
by front
sight
that means a
long trip to
direct support
for you guys.
it’s our
butt-
stocks
that are a
little bit loose,
not our barrels.
some guys don’t
know a loose butt-
stock from a hole
in the ground.
install
the sight
like this…
how will
we ever get
together?
we don’t
seem to be
a good fit.
I can help
you two with
this fitting
solution!
AN/PVS-4 Night Sight
• adapter, NSN 4933-01-447-8991
• 2 screws, NSN 5305-01-015-5686
(Install with 5/32” hex key)
• rail grabber assembly, NSN 5340-01-449-8533
• 2 screws, NSN 5305-00-928-9540
(Install with 1/8” hex key)
they tell
me you
All
have loose
barrels.
just
hold on
there,
whizzo!
620. 16-17 (C)
6/6/04
9:42 AM
Page 1
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