PS Magazine - TB 43-PS-667
PS, The Preventative Maintenance Monthly
ISSUE 667
JUNE 2008
JUNE 08
23
PS 667
JUNE 08
PS 667
22
If you screw in the barrel the correct way, you don’t need extra help keeping the
barrel tight. The spin of the rounds going through the barrel will actually help keep it
tight because the spin twists the barrel tighter.
Screw in the barrel the right way by turning it clockwise until it’s flush against
the receiver. Then put on the barrel wrench and tap it lightly once with a hammer so
the barrel turns a bit farther clockwise. The barrel is now tight for Fring and it will
stay tight.
MK 19 Machine Gun…
Barrel
Doesn’t
Need Extra Help
No
Click,
No Go
keep that
loctite away
from me!
I don’t need
any extra
barrel help.
the procedure is in
wp 0065 00-4 in
tm 9-1010-230-23&p.
some armorers
think the mk 19
barrel needs
extra help
staying tight.
so they put
loctite on the
barrel threads
before screwing
on the barrel.
that certainly keeps
the barrel tight, but
the loctite makes it
almost impossible to
unscrew the barrel.
Once barrel is flush against
receiver, slightly tighten it
more with the barrel wrench
if you have to
turn and turn
the on/off
knob on your
m68 reflex
sight to turn
it off or on,
you’ve got a
loose knob.
all that
turning
wears out
the sWitch!
then you
can’t turn
the m68
off or on.
during pmcs,
make sure
the knob is
flush against
the housing
and that it
clicks when
you turn it.
tell your
armorer.
stop
turning
my knob
already.
it’s loose
and needs
tightening.
If knob
isn’t
flush or
doesn’t
click
when
you turn
it, it’s
loose
Armorer can
tighten two
set screws
M68 Reflex Sight…
667.22-23.indd
1-2
5/5/08
6:15:22 PM
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