PS Magazine - TB 43-PS-717

PS, The Preventative Maintenance Monthly

ISSUE 717

AUGUST 2012
PS Magazine - TB 43-PS-717 - Page 22 of 33
41
PS 717
AUG 12
± The±short±barrel±doesn’t±extend±past±the±protection±kit±or±shield,±which±means±bullets±
could±ricochet±off±the±inside±of±the±shield±and±hit±anyone±in±the±vehicle.±Using±the±M249’s±
long±barrel±prevents±that±disaster.
± Remember±any±machine±gun±used±with±the±gunner’s±protection±kit±or±shield±must±be±
synchronized±so±that±the±weapon±turns±with±the±kit±or±shield±and±the±barrel±stays±in±the±
center±of±the±shield’s±slot.±If±the±barrel±is±banging±against±the±shield±as±the±mount±is±rotated,±
eventually±the±barrel±will±be±damaged.
± To±synchronize±the±M249±(or±M240B)±with±the±shield±when±the±weapon±is±mounted±on±
the±M197±mount,±you±must±install±the±pintle±lock,±NSN±5340-01-500-5572,±like±so:
Dear Editor,
When your unit receives the new M2A1 machine gun, you will need to turn
in your old M2s. You will no longer need the M2 headspace and timing gages
because the M2A1 isn’t headspaced and timed by you. That’s done by field
maintenance.
But don’t turn in the M2 gages through your local calibration team. The
gages need to stay with the M2 when you turn it in, because the gages are
part of the M2’s BII. They will be needed by whatever unit receives the M2.
Gerald Davison
TACOM LAR
Ft Riley, KS
1.±
With±the±pintle±mounted±and±
facing±forward,±remove±the±screw±
and±lanyard±from±the±right±side.
2.±
Slide±the±pintle±lock±over±the±
outside±of±the±pintle,±aligning±the±
tapped±holes±on±the±sides±with±
the±holes±in±the±lever.±
3.±
On±the±right±side,±insert±one±
hexagon±head±screw,±NSN±5305-
00-685-3511,±with±a±lock±washer,±
NSN±5310-01-433-0941,±through±
the±lanyard±tab±and±pintle±lock±
and±into±the±pintle.±Tighten±the±
screw±to±10±lb-ft.
4.±
Insert±an±identical±hexagon±screw±and±lock±washer±through±the±pintle±lock±and±into±
the±pintle±on±the±left±side.±Tighten±it±to±10±lb-ft.
5.±
Do±a±function±test±to±make±sure±the±square±protrusion±on±the±bottom±of±the±pintle±
lock±seats±snugly±into±the±groove±of±the±M197±pintle±adapter.
Editor’s note:
I gage that
to be a good tip, Gerald.
Thanks for the heads-up.
Short Barrel Comes Up
Short with Gunner’s Shield
M249
Machine
Gun…
Short Barrel Comes Up
Short with Gunner’s Shield
M2±Machine±Gun…
Turn in
Gages
with M2
Install±pintle±lock±to±
synchronize±M249±
with±kit±or±shield
whoa!
you’re not
mounting
me
until
you put
on my
long
barrel!
my short
barrel
can’t reach
beyond the
gunner’s
shield!
I told you
I needed the
long
barrel!
ok, I’m leaving
now that you’re
getting this new-
fangled m2a1…
…but I need
my headspace
and timing gages
before I go.
I’ll need
them on
my
next
job!
if you’re
firing the m249
machine gun
mounted with
the gunner’s
protection kit
or gunner’s
shield,
don’t
use the m249’s
short barrel.
for more information, see
tacom lcmc gpa 12-012:
mil/safety/serviced.cfm
717 40-41.indd
1-2
6/22/12
11:49 AM
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