PS Magazine - TB 43-PS-614
PS, The Preventative Maintenance Monthly
ISSUE 614
JANUARY 2004
Moderate
Moderate
Moderate
Moderate
Moderate
Moderate
Moderate
No lube
No lube
No lube on
front of bolt
Heavy
Heavy
Heavy
Light
Light
Light
Light
Light
Light
Light
Light
PS 614
15
Remember to keep TW-25B off the face of the bolt and out of the inside of the bar-
rel. Lube on the bolt face leads to carbon buildup. Lube can damage the barrel liner.
Use RBC to clean inside and outside the barrel.
Cleaning While Mounted
The barrel extension can become sticky and gritty during firing, which makes it dif-
ficult for the bolt to move. But it's no problem to clean the extension while the gun is
mounted:
Let the gun cool enough so it's safe to touch. Follow the steps for reloading until you
reach the point where the cover is up. Make sure the ARM switch is set to SAFE and
the bolt is locked to the rear.
Use a clean rag wrapped around a stick to clean inside the barrel extension, espe-
cially along the inner walls. Be very careful—the barrel grooves can be razor sharp.
If the extension is sticky or gritty, clean it with a rag. Then use a small brush to put
on a moderate coat of TW-25B. After lubing, cycle the gun to spread the lube.
Check the extension after ever 1,250 rounds fired to see if more cleaning is needed.
Headspace Help
If the M3P loses headspace during firing, the gun jams and the bolt and barrel may
be damaged. And if the barrel locking spring is weak, the gun loses headspace.
What weakens the spring
is letting it ride on the bar-
rel as you screw or unscrew
the barrel. Keep the spring
strong by holding the spring
up slightly with a screw-
driver or something similar
as you turn the barrel.
Once the barrel is locked
in, try to turn it. If there's
any play, the locking spring
needs to be replaced. Don't
fire the gun. It's not safe.
Rate of Fire
The rate of fire should be 950
to 1,100 rounds per minute. If it's
not, you'll have feeding prob-
lems. Check the rate of fire on the
control display terminal (CDT).
If it's wrong, reset it like it says in
Para 4-7e in TM 9-1425-433-10.
For more info on taking care of
the M3P, see Steps 2-10 in Table
2-1 and Chapter 4 in the -10.
Use this guide
for how much
lube to use and
how to apply it:
• Light--
white grease is slightly visible. Use a small brush
or cleaning patch. They're part of the Avenger BII.
• Moderate--
grease is visible. Use a brush or patch.
• Heavy--
grease is plentiful. Use a large brush.
Hold spring up
while turning
barrel
Any play means
it’s time for a new
locking spring
Check rate
of fire on
CDT and
adjust if
necessary
614. 14-15 (C)
12/1/03
10:22 AM
Page 1
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