MIL-DTL-63997C
3.4.3.1 Fire control selector positions. The fire control selector shall have three positions;
safe, semi-automatic and burst. On the weapon, these positions shall be labeled as SAFE, SEMI,
and BURST.
3.4.3.2 Fire control selector motion. When the hammer is cocked, the fire control
selector shall rotate manually from one position to another without binding.
3.4.3.3 Fire control selector position retention. The fire control selector shall remain in
place in each position by a perceptible spring detent load until manually reset. The load shall be
evidenced by a tactile (see 6.10.8) resistance as the selector is arriving and leaving the position.
In addition an audible click shall be heard when the detent engages.
3.4.3.4 Fire control selector in SAFE position functioning. With the hammer cocked and
the fire control selector in the "SAFE" position, the hammer shall not be released when the
trigger is pulled. As a result the weapon shall be incapable of being fired.
3.4.3.5 Fire control selector in SEMI position functioning. When the selector is placed in
the "SEMI" position, the selector shall allow the semi-disconnect to engage the hammer, so that
the weapon is capable of semi-automatic firing only (single shot with each pull of the trigger).
3.4.3.6 Fire control selector in BURST position functioning. When the selector is placed
in the "BURST" position, the automatic sear shall engage the hammer, so that the weapon is
capable of burst firing. One, two, or three continuous shots the first time the trigger is pulled and
held back. Three continuous shots on the second and each successive time the trigger is pulled
and held back. One, two or three shots if the trigger is released before completion of the three
shot cycle or all cartridges are expended before completion of the three shot cycle.
3.4.4 Bolt catch.
3.4.4.1 Bolt catch motion. The bolt catch shall move from its recessed position, out of
the bolt carrier's way, to its raised position, a position where it can retain the bolt. Movement
from the raised to recessed position shall be under spring action.
3.4.4.2 Bolt catch retention. The bolt catch shall be securely retained on the lower
receiver by the bolt catch spring pin.
3.4.4.3 Bolt catch passive action. When positioned manually, the bolt catch shall remain
engaged and shall hold the bolt carrier in the open position. When positioned by action of the
magazine follower, the bolt catch shall remain engaged and shall hold the bolt carrier in the open
position.
3.4.4.4 Bolt catch release. When the bolt catch release is depressed (held in the "down"
position by the bolt catch plunger and spring), the bolt catch shall recess and allow a retained
bolt carrier to return to the battery position (see 6.10.11).
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