MIL-DTL-71186A
3.5.3.2 Rail cover retention. The rail covers shall be securely retained on the rail adapter
system by the retaining clip.
3.5.4 Vertical pistol grip.
3.5.4.1 Vertical pistol grip motion. When the lock assembly is unlocked, the vertical
pistol grip shall move freely along the rail adapter system without binding.
3.5.4.2 Vertical pistol grip retention. The vertical pistol grip shall be securely retained on
the rail adapter system by the lock assembly.
3.5.5 Front sight assembly.
3.5.5.1 Front sight assembly retention. The front sight assembly shall be securely retained
on the barrel assembly by two taper pins.
3.5.5.2 Front sight post retention. The front sight post shall be held in position by the
spring loaded front sight detent.
3.5.5.3 Front sight post adjustment. 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 post.
When the weapon is zeroed, there shall be at least 16 additional clicks of adjustment available in
a downward direction.
3.5.6 Back-up iron sight.
3.5.6.1 Back-up iron sight retention. The back-up iron sight shall be securely retained in
the rearmost slot on the upper receiver using the recoil screw and the locking bar.
3.5.6.2 Back-up iron sight motion. The rear sight shall pivot to full vertical position
under spring action when at the extreme left and extreme right windage positions.
3.5.6.3 Back-up iron sight windage knob position retention. The windage knob shall be
held in position by the spring loaded detent.
3.5.6.4 Back-up iron sight windage knob motion. 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.
3.5.6.5 Back-up iron sight trajectory compensation. The rear sight shall be capable of
elevating, by means of the sight cam, to compensate for trajectory for ranges from 200 meters to
600 meters.
3.5.7 Ejection port.
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