PS Magazine - TB 43-PS-555
PS, The Preventative Maintenance Monthly
ISSUE 555
FEBRUARY 1999
Screws lock-wired?
M203 Grenade Launcher . . .
Unlatch the trigger guard. That lets
the M203 relax in the rack. If the guard
is left engaged, it puts pressure on the
M203’s mounting hardware and the
M203 will work loose more quickly.
Storage
—Store M203s mounted on
the M16 or M4 in the M12 rack with
the quadrant sights set at 50. At any
other setting, the rack locking bar will
damage the sight.
Cartridge locator and retainers
—
They’re easily overlooked, but if they’re
damaged or missing they cause poor
extracting and make it difficult to close
the barrel.
Barrel
—If you’re part of a hard-
charging unit, count on damaged bar-
rels. The aluminum barrel can’t take
hard knocks. If a barrel is out-of-round,
dented, or cracked, get it replaced to
avoid dangerous short fires.
Barrel out-of-round, dented or cracked?
Set at 50
Unlatch trigger guard
Breech inserts loose or protruding?
me,
too!
Keep CLP away from bushings
Locator
Retainers
Check cartridge locator and retainers
PS 555
41
FEB 99
PS 555
40
FEB 99
Movement
—There should be no
movement of the M203 up and down
the barrel. But it’s OK to have up to
1
/
8
inch side-to-side movement from each
side of center if the total movement is
no more than
1
/
4
inch.
Bushings that don’t do their job are
the usual cause of a loose M203. And
bushings can’t hold if they’re slick with
CLP. Tell your unit to keep CLP away
from the bushings.
Breech insert
—If you’re finding lots
of loose or protruding breech inserts,
it’s time for a talk with your unit.
They’re dry firing their M203s, which
chews up the inserts. M203s should be
dry fired only during the function
check.
Check that the mounting bracket
screws are lock-wired. If they’re not,
wire ’em or the screws will work loose.
i'm
all
ears
!
Listen up,
armorers!
This is what
you need to
know about your
M203 grenade
launchers.
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