MIL-DTL-63997C
3.5.5.4 Rear sight trajectory compensation. The rear sight shall be capable of and
calibrated for elevating, by means of the elevation knob, to compensate for trajectory for ranges
from 300 meters to 800 meters.
3.5.6 Ejection port.
3.5.6.1 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.
3.5.6.2 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.
3.5.6.3 Ejection port cover retention. The cover shall be securely retained in the closed
position by the cover detent.
3.5.7 Forward assist assembly.
3.5.7.1 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
position.
3.5.7.2 Forward assist assembly action. Depressing and releasing the forward assist shall
cause progressive movement of the bolt carrier assembly into the battery position.
3.5.8 Compensator alignment. The third (middle) slot must be straight up at top dead
center (TDC). TDC is defined by the front sight post. The alignment may vary as much as one
half the width of the slot either direction.
3.5.9 Front sling swivel.
3.5.9.1 Front sling swivel motion. The front sling swivel shall move between its forward
position, touching the barrel, to its rear position, touching the handguards, without binding.
3.5.9.2 Front sling swivel retention. The front sling swivel shall not disassemble from
the weapon because it is securely retained to the front sight assembly by the rivet.
3.5.10 Bolt carrier assembly.
3.5.10.1 Key and bolt carrier assembly lock. The bolt carrier and key assembly shall
move through its full range of travel without binding in the upper receiver.
3.5.10.2 Firing pin.
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