PS Magazine - TB 43-PS-604

PS, The Preventative Maintenance Monthly

ISSUE 604

MARCH 2003
PS Magazine - TB 43-PS-604 - Page 14 of 33
MAR 03
25
M249 Machine Gun…
Don't Go
Off
Half-
Cocked!
PS 604
24
M4A1 Carbine
To lock M4A1s in the M12 rack, you
need an adapter bar on the rear of the
arms rack. Your support makes the bar
following the instructions on Page 2-70
in Change 4 to TM 9-1005-319-23&P.
M16A4 Rifle
To lock the M16A4 in the M12
rack, you may need to move
back the carrying handle one
notch to the rear. The carrying
handle must be returned to the
original position for firing to
maintain the zeroing.
Mounting Rail System
But if the mounting rail system is
installed on the M16A4 or M4A1, more
drastic action may be needed. The
rack’s locking bar may no longer close
and a single locking bar may be needed.
To get instructions for a single locking
bar, contact TACOM-Rock Island’s
James Rollins at (309) 782-1797/DSN
793-1797 or e-mail
rollinsj@ria.army.mil
Any M12 racks that are fitted with the adapter bar or single locking bar must be
certified as secure. Contact your local TACOM-Rock Island logistics assistance
representative or James Rollins for details.
S
ome armorers are scratching their
heads about how to make the M4A1 car-
bines and M16A4 rifles fit in the M12
rack. Well, STOP SCRATCHING.
Here’s what you need to know:
Remember to push the cocking handle forward until
it clicks in place after you lock back the bolt. If you
forget, the handle is left flapping. During firing, the
handle bangs against the cocking handle assembly
stop and wears out the receiver rails and handle over
time. Worn-out rails are not fixable. Your M249 is on
a one-way trip to the boneyard.
Push cocking
handle forward
until it locks
hey!
We’re not
secure in
here!!
we have to be
locked in tight
when you leave
us alone!
Adapter
bar
Move carrying handle back one notch
Mounting rail installed? Rack locking
bar may need to be installed
M16A4 Rifle/M4A1 Carbine…
You
don't
want to go off
half-cocked in
your life or
with your M249
machine gun.
Remembering
the boneyard.
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