PS Magazine - TB 43-PS-558
PS, The Preventative Maintenance Monthly
ISSUE 558
MAY 1999
M249 Machine Gun . . .
Cover assembly:
Cover won’t lock shut or
stay up? Bent? Cracked? Barrel locking
lever and cover assembly torsion springs
weak? Feed pawl pivot posts loose?
Trigger mechanism assembly:
Broken,
chipped or cracked? Holding lug or sear
burred, cracked, chipped or worn?
Gas regulator (old style
barrel only)
—Set on
ADVERSE? Set to NORMAL.
Cocking handle:
Binds or broken?
Receiver:
Bent, cracked, dirty?
Retaining clips missing on
takedown and pivot pins?
Ejection port cover:
Edges
sharp, cracked or bent?
Ejection port catch loose?
Safety:
Bolt moves forward from the rear
when safety is on? Doesn’t catch detent
spring when pushed to right or left limits?
Flaps back and forth?
Push safety to right. Red band visible?
Push safety to left. Red band not visible?
Barrel:
Won’t lock securely in receiver?
Barrel locking lever spring weak? Flash
suppressor loose, cracked, dented or burred?
Magazine well:
Burred?
Links or brass inside?
Rear sight:
Cracks in the azimuth
and elevation knobs? Knobs bind
or do not click when turned?
Front sight:
Loose?
Bipod:
Bent or cracked? Legs
bind or won’t lock in place?
Handguard:
Heatshield cracked,
damaged or missing? Retaining
clips missing on handguard and
feedtray cover pins?
before
you go to the
field
,
gunners, give
your m249 machine gun
this checkup
. if you find
any problems
, tell
your
armorer
.
Return rod and transfer mechanism:
Burred or cracked? Broken pins?
Slide:
Burred?
Cracked?
Broken pins?
Roller doesn’t
retract?
Piston:
Burred or cracked? Housing moves when you pull on it?
Bolt:
Binds? Fails
to lock in cocked
position? Firing pin
spring missing?
Extractor lip
chipped or broken?
Extractor pin
sticking up?
PS 558
43
MAY 99
42
MAY 99
Rails:
Worn, burred or chipped?
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