MIL-DTL-71186A
3.4.3.1 Fire control selector positions. The fire control selector shall have three positions;
safe, semi-automatic and automatic. On the weapon, these positions shall be labeled as SAFE,
SEMI, and AUTO.
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 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 AUTO position functioning. When the selector is placed
in the "AUTO" position, it shall permit the automatic sear to engage the hammer, so that the
carbine is capable of automatic firing (continuous firing until the trigger is released or all
cartridges are expended).
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).
3.4.5 Magazine catch.
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