PS Magazine - TB 43-PS-602
PS, The Preventative Maintenance Monthly
ISSUE 602
JANUARY 2003
If the GO end fits and the NO GO end doesn't, the headspace is OK. If the GO
end still won't fit, repeat these last five steps until it does.
Do not unscrew the barrel more than five clicks beyond the first two clicks in
steps 1-5. If you have to turn the barrel more than seven clicks, something's wrong.
Tell your armorer.
Headspace Too Tight
JAN 03
1.
Pull back the charging handle
until the barrel-locking spring lug
is centered in the
3
⁄
8
-in hole.
2.
Unscrew the barrel one click.
5.
Pull the charging handle back to
cock the weapon.
4.
Pull back on the charging handle
until the barrel extension and trun-
nion block are about
1
⁄
16
inch apart.
5.
Insert the GO gauge again.
7.
Pull the charging handle back until
the barrel extension and trunnion
block are no more than
1
⁄
16
inch apart.
8.
Keep the charging handle back
to maintain the
1
⁄
16
-in separation.
4.
Unscrew the barrel two clicks,
remove the link and let the bolt go
forward.
To see if the barrel is locked with
the bolt in the forward position, try
to turn the barrel in either direction.
If it turns, something's wrong. Don't
try to fire. Tell your armorer.
Raise the extractor and try to insert
the GO gauge all the way up to the
ring in the T-slot between the bolt
face and rear of the barrel.
If the GO end goes down the T-slot
to the center ring and the NO GO
won't go in, headspace is OK.
3.
Ease the bolt forward.
6.
Ease the bolt forward.
GO
NO GO
If the GO
end won't fit,
headspace is
too tight. Do
this…
PS 602
17
so what
do you do if
headspace
is
bad?
read on…
Lug
Hole
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