PS Magazine - TB 43-PS-675
PS, The Preventative Maintenance Monthly
ISSUE 675
FEBRUARY 2009
20
PS 675
FEB 09
21
PS 675
FEB 09
S
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ome defective M249 machine gun rear sights have gotten into the Feld. Because
the sight elevation knobs were installed wrong, you can’t zero the sights beyond
300 meters.
It’s easy to tell if you have a bad sight.
Check to see if the line on the elevation
cam assembly matches up with the lines on
the rear sight base at each of the detents. If
they don’t, you’ve got a bad sight.
You can continue to use the M249
while you’re waiting for a new sight. Just
be aware it won’t be accurate beyond
300 meters. The bad sight is no problem,
though, if you’re using ACOG, M68, or
M145 sights.
If you’re not deployed, contact your local logistics assistance representative (LAR)
to get a new sight. If you’re deployed in Baghdad, contact the Small Arms Support
Center at DSN 312-987-5130 (ext. 6805 or 6806), (732) 427-5130 (ext. 6805 or
6806), or email:
smallarmsbaghdad@mmcs.army.mil
±or Balad’s Small Arms Support Center, call 312-987-5130 (ext. 6050) or email:
steelez@mmcs.army.mil
±or Afghanistan, call the Small Arms Support Center at DSN 312-987-5130 (ext.
6050) or email:
alexanderw@mmcs.army.mil
±or more info, see TACOM maintenance advisor message 08-041:
It’s easy enough to tell if the sear is still up
to the job. After clearing your M240, move
the safety to F (±re) and pull the cocking
handle completely to the rear to lock back
the bolt. Then return the cocking handle
to the forward locked position. Place the
safety in the S (safe) position and depress
the trigger. Nothing should happen.
Next move the safety to F and hold the
cocking handle to the rear while you fully
depress the trigger. Then ease the bolt
forward until it locks. You should not be
able to move the safety to S.
If your M240 flunks this test, it shouldn’t
be ±red. Tell your armorer. He needs to
check it out.
The reason sears wear out fast is because gunners don’t pull the trigger fully to the
rear when ±ring and don’t release the trigger fully when they’ve ±nished ±ring. So
remember to pull the trigger completely back to keep the sear healthy.
Another good health tip for the sear is to store your M240 with the safety on F and the
bolt locked forward.
Sighting Bad Sights
M249 Machine Gun…
Sighting Bad Sights
M240-Series Machine Gun…
if the sear
becomes
too
worn
on your
m240-series
machine gun, the
m240 could fire
when you
don’t
want it to.
that could
hurt your
popularity in
your unit.
Place safety
on
F
and pull
cocking handle
to rear to lock
back bolt
When you depress trigger,
nothing should happen
watch
it!!
If lines don’t align, sight is bad
I can’t shoot
straight farther
than 300 meters!
you’ve got a
bad
sight.
we’ll get you
fixed
quick!
Return cocking
handle to
foward locked
position and
put safety on
S
hey!
675.20-21.indd
1-2
12/18/08
1:23:32 PM
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