PS Magazine - TB 43-PS-720
PS, The Preventative Maintenance Monthly
ISSUE 720
NOVEMBER 2012
41
PS 720
NOV 12
Questions?
We’ve Got Answers
± What± is± the± difference± between± the±
M16A2±and±M16A4±riFes±and±bolts?
± The±M16A2±barrel,±NSN±1005-01-146-7684,±
has±a±
1
/8-in±taller±front±sight±assembly±than±
the± M16A4± barrel,± NSN± 1005-01-454-1629.±
This± is± because± of± the± M16A2’s± carrying±
handle±and±rear±sight.±
± The± same± breech± bolt± assembly,± NSN±
1005-01-505-1035,± is± actually± used± on± all±
the±M16A2±and±M16A4±rifles±and±M4/M4A1±
carbines.
Some
bad
hammer
release levers for
the M9 pistol have
gotten into the
supply system.
They can cause
your pistol to
jam!
when you
do your
PMCs, make
a point to
check your
M9’s hammer
release
lever for
cracks, nicks,
and
burrs.
if You
spot any
prOblEms,
tell your
RepairMan
so he can
replace
the lever.
± We± are± seeing± new± M48± machine±
gun±barrel±extensions±that±have±a±small±
stake±in±them±that±prevents±the±barrel±
from± being± completely± screwed± in.± Is±
this±normal?
± Yes.± Sometimes± a± burr± is± left± on±
the± barrel± extension’s± threads± when±
it’s± machined.± Usually,± when± you± first±
screw±in±the±barrel,±the±burr±breaks±off.±
If±it±doesn’t,±the±burr±can±be±removed±
by±carefully±filing±or±stoning±it.
± There±are±two±different±bolt±latches±(or±manual±control±levers)±for±the±M2±machine±
gun,±but±they±have±the±same±NSN.±One±latch±has±an±adjustable±clearance±between±the±
receiver±and±bolt±latch±and±the±other±has±a±fixed±clearance.±Is±there±any±way±to±specify±
which±one±you±get?
± The±bolt±latch±with±the±fixed±clearance±hasn’t±
been±used±in±20±years.±If±you±receive±it,±you±should±
file±a±PQDR.±The±adjustable±bolt±latch,±NSN±1005-
00-550-4060,±is±the±only±one±that±should±be±used.±
The±clearance±for±the±bolt±latch±assembly±and±the±
receiver±sideplate±should±be±.003±to±.005±inch.±See±
WP±0015±00-10±in±TM±9-1005-347-23&P±(Jul±11).
± One±other±good±
grounding±tip±is±to±do±
a±monthly±test±of±the±
grounding±wire±to±make±
sure±it’s±in±good±shape.±
Disconnect±the±grounding±
wire±and±run±a±continuity±
check±on±it.±If±you±get±
more±than±1
±
1
/
2±volts,
you±may±need±a±new±
grounding±wire.±
±
±SPC±Gilbert±McClamroch
±E±Btry,
± 5/52±ADA
±Ft±Bliss,±TX
Editor’s note:
I think you are on solid ground with
your suggestions. A good resource for grounding info is
CECOM’s
Earth Grounding and Bonding
pamphlet. You
can get it by calling DSN 648-3812 or (443) 395-3812.
Small
Arms…
M9±Pistol…
Lok fOr
defective
hamer Release lever
Monthly±
disconnect±
grounding±
wire±and±
run±a±
continuity±
check
±If±you±
get±more±
than±1
1
/
2±
volts,±you±
may±need±
a±new±
grounding±
wire
The±only±
M2±bolt±
latch±to±use±
is±the±one±
with±an±
adjustable±
clearance
If±M48±barrel±extension±has±a±burr±
on±threads,±try±screwing±in±barrel.
If±that±doesn’t
break±off
the±burr,
file±it
off
ps recently
visited the small
arms shop at the
ft bliss dol.
armorers
will find
the answers
helpful.
The repairmen
there had the
following
questions.
my barrel’s front sight
assembly is slightly
bigger than yours… but we
use the same breech bolt.
don’t tell me!
tell them!
that’s right!
we’re
bad!
tee-
hee-
hee!!
ta-
dah!
720 40-41.indd
1-2
9/24/12
4:01 PM
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