MIL-DTL-70599C
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.
3.5.7.1 Ejection port cover motion. The ejection port cover shall operate between its
closed position and its open position (resting on the lower receiver) without binding. Movement
from the open to closed position shall be under spring action.
3.5.7.2 Ejection port cover action. The ejection port cover shall open under spring action
when the bolt carrier is moved from the locked position rearward, or from the open position
forward.
3.5.7.3 Ejection port cover retention. The cover shall be securely retained in the closed
position by the cover detent.
3.5.8 Forward assist assembly.
3.5.8.1 Forward assist assembly motion. When depressed, the forward assist assembly
shall move from its fully outward position (where the pawl is completely disengaged from the
bolt carrier) to a position where the pawl engages the bolt carrier, in battery position. When
released, the forward assist assembly shall return under spring action to its fully outward
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