MIL-DTL-63997C
3.4.5 Magazine catch.
3.4.5.1 Magazine catch action. The magazine catch, under spring action, shall securely
retain the magazine in the magazine well. An audible click shall be heard when the catch
engages.
3.4.5.2 Magazine catch tension adjustment. The spring tension of the magazine catch
shall be adjustable by depressing the magazine release button and rotating the magazine catch
clockwise to tighten; counterclockwise to loosen. Spring tension shall be measured by the tactile
resistance observed as the magazine overcomes the magazine catch.
3.4.6 Magazine release button.
3.4.6.1 Magazine release button action. When the magazine release button is depressed,
it shall disengage the magazine catch from the magazine and permit removal of the magazine.
3.4.6.2 Magazine release button and bolt catch interaction. When the bolt is held open
(rearward) by the bolt catch, and the magazine release button is depressed, the empty magazine
shall be ejected by the spring tension in the magazine follower spring.
3.4.7 Disconnects.
3.4.7.1 Semi-disconnect.
3.4.7.1.1 Semi-disconnect motion. When the fire control selector is placed in the
"SEMI" position, the fire control selector shall rotate the semi-disconnect from its neutral
position (not engaging the hammer) to its active position (engaging the hammer). When the
selector is removed from the "SEMI" position, the selector shall rotate the semi-disconnect back
to its neutral position.
3.4.7.1.2 Semi-disconnect action. When the selector is in the "SEMI" position and the
trigger is held back, the semi-disconnect shall engage and restrain the hammer in the cocked
position until the trigger is released. When the trigger is released, the semi-disconnect shall
allow the hammer to return to the normal cocked position (when the hammer is held back by
only the trigger). The transfer from the semi-disconnect to the normal cocked position shall
cause an audible click as the trigger engages the hammer.
3.4.7.2 Burst disconnect.
3.4.7.2.1 Burst disconnect motion. When the fire control selector is placed in the
"BURST" position, the fire control selector shall rotate the burst disconnect from its neutral
position (not engaging the hammer or the burst cam) to its active position (engaging in the
deepest notch of the burst cam). When the selector is removed from the "BURST" position, the
selector shall rotate the burst disconnect back to its neutral position.
3.4.7.2.2 Burst disconnect action. When the selector is in the "BURST" position and the
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