PS Magazine - TB 43-PS-670
PS, The Preventative Maintenance Monthly
ISSUE 670
SEPTEMBER 2008
20
PS 670
SEP 08
21
PS 670
SEP 08
Dear Chief D.C.,
Good question. First of all, for
accurate zeroing, the BUIS must be in
the last slot to the rear.
For the M4/M4A1, the line on the
left-side cam must align with the 300-m
mark. For the M16A4, the line should be
between the 300-m and 400-m marks.
Dear Half-Mast,
When you zero the M16A4 rifle or the M4/M4A1 carbine with the
backup iron sight (BUIS), do you place its knob on the white line or on
the 300-m mark?
CW3 D.C.
The old extractor spring assembly,
NSN 5360-01-424-5899, is still in stock
and may be ordered for use only on the
M16. The old breech bolt assembly, NSN
1005-01-422-3770, is also still in stock
and may ordered only for the M16.
Once stock of the two assemblies are
exhausted, order only the newer extractor
spring
assembly,
NSN
5360-01-505-
2886. It’s gold colored–the old one is
dark colored. Order the new breech bolt
assembly with NSN 1005-01-505-1035.
M16A4 Rifle, M4/M4A1 Carbine…
What’s the Zero Mark?
M16-Series Rifle, M4/M4A1 Carbine…
G
o
f
o
r t
h
e G
o
l
d
!
BUIS goes in rear slot
For M4/M4A1,
use 300-m mark
For M16A4,
set sight
between
300-m and
400-m
marks
hmmm,
I’m not
exactly sure
how we zero
your buIs.
nothing in
the -10 tm
on that!
the m16 rifle
and the m4/
m4a1 carbine
can now use
the same
extractor
spring
assembly.
New extractor
spring is gold
with a black
insert
I’m going for the
gold
when it comes to
extractor springs!
and
soon… so
will I!
well, we’d
better find
out!
That means
in the near
future the
M16 and M4
will also
use the same
breech bolt
assembly.
670.20-21.indd
1-2
7/31/08
3:50:23 PM
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