PS Magazine - TB 43-PS-575
PS, The Preventative Maintenance Monthly
ISSUE 575
OCTOBER 2000
Timing nut
. If the timing nut can be
moved with one finger or it doesn’t
click as you move it, its spring is weak
and it won’t hold timing. Tell your ar-
morer.
2.
Pull the charging handle back
until the barrel-locking spring lug is
aligned with the
3
/
8
-in hole on the
receiver’s right side. To keep the bolt
back, insert the small loop of an M2
ammo link between the trunnion block
and barrel extension.
How to Headspace
Barrel and barrel extension
threads
. If the threads are chipped or
burred, it will be difficult to screw in
the barrel. What’s worse, you may think
you’ve screwed in the barrel, but you
haven’t. Result: bad headspace. Your
armorer can usually stone chips and
burrs smooth.
Gauges bent, rusted, pitted?
Locking spring loose, weak or broken?
Burred or chipped threads?
iming and headspacing
are
every-
thing when it comes to firing your M2
machine gun. If you don’t headspace
and time your M2
every time
before
you fire or after you change the barrel,
a round can go off inside the gun. That
could injure you and damage the gun.
Pre-check Checks
If your M2’s in bad shape now, you
won’t be able to headspace and time it
later. So before you go to the field, do
these checks:
Gauges
. If the headspace and tim-
ing gauges are bent, rusted or pitted,
you can’t accurately gauge, so tell your
PS 575
45
PS 575
44
OCT 00
M2 Machine Gun . . .
Barrel locking spring
. If the spring
can’t hold the barrel in place, the bar-
rel can turn during firing and headspace
is lost. So test the spring by getting the
correct headspace and then trying to
unscrew the barrel. If the barrel turns,
the spring is weak or loose. Tell your
armorer.
armorer. He can order new gauges with
NSN 5250-00-535-1217.
you've
got a
headspacing
problem
!
hey,
thAT'S
NOT VERY
NICE
.
1.
Raise cover completely.
3.
Screw barrel all the way into barrel
extension.
Test timing
nut spring
Lug
Hole
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