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|  MIL-R-63997B(AR)
3.3.3.1.1 Barrel assembly straightness.
The barrel assembly
shall be straight to the extent that a cylindrical plug with a
diameter of .2173 + .0001 inches, and six (6) inches in length
must drop through the barrel bore of its own weight.
Also, a self
aligning plug shall be inserted three (3) inches into the barrel
bore at the muzzle, may have an angular deviation from the
t h e o r e t i c a l a x i s o f z e r o d e g r e e s a n d t h r e e m i n u t e s ( Oo 3 ' ) .
3.3.3.2
Gas tube.
The gas tube shall be securely retained
to the front sight assembly by the gas tube spring pin.
The gas
tube shall be free of mutilations and postioned for proper
alignment with the bolt carrier key.
3.3.3.3. H a n d g u a r d The two-piece handguard shall be held
f i r m l y i n p l a c e by the handguard cap and the spring loaded slip
ring in the barrel nut assembly.
When the slip ring is depressed
rearward the handguards shall be capable of being removed.
3.3.3.4 Front sight. The front sight shall be securely
attached to the barrel assembly by two taper pins.
The front
sight post shall be held in position by the spring loaded front
sight detent.
The detent, when depressed, shall disengage the
front sight post and allow vertical adjustment of the post,
Clockwise rotation of the front sight post, as indicated by the
arrow on the top of the front sight, shall lower the front sight
When the rifle is zeroed as specified in 3.4.6, there shall
post.
be at least 16 additional clicks of adjustment available in a
downward direction.
The front sight shall provide a means for
retaining and positioning a bayonet knife.
Rear sight.
3.3.3.5
The rear sight shall pivot to full
vertical position of both normal and short range peeps and be held
in each position under spring action when at the extreme left and
extreme right windage positions.
The windage knob shall be held
in position by the spring loaded detent.
The windage knob shall
be capable of rotating seven complete revolutions, moving the rear
sight from the extreme left to the extreme right without binding
The rear sight shall also be capable of and calibrated for
elevating, by means of an elevation knob, to compensate for
trajectory for ranges from 300 meters to 800 meters.
T h e 0-200
meter setting shall be accomplished by setting the elevation knob
o n 300 meters and " f l i p p i n g - u p " t h e c l o s e r a n g e r e a r s i g h t p e e p .
The rear sight shall be adjusted as specified in 3.4.6.
3.3.3.6
Ejection port cover.
The ejection port cover shall
operate through i t s f u l l range of travel under spring action
without binding.
The cover shall be retained in the closed
position by the cover detent, and shall open under spring action
when the bolt carrier is moved from the locked position rearward,
or from the open position forward.
6
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