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|  MIL-S-63348A(AR)
3.2 Parts and assemblies. The Submachinegun and its parts
shall conform to the dimensions, conditions and construction
requirements specified herein and on Drawing 9327045 and all
associated drawings, and shall be in accordance with the applicable
provisions of MIL-W-13855.
3.2.1 Drawings. Dimensions on Drawing 9327045 and all
associated drawings are in the English system of units.
3.2.2. Heat treatment. Hardness shall be as specified on the
applicable drawings. Dimensions on drawings shall apply after
applicable heat treatment of the part.
3.2.2.1 Surface roughness.
Surface roughness (ANSI Y14.36) is
stated in micro-inch units
3.2.3 Manufacturing.
Unless otherwise specified, manufacturing
procedures stated on drawings are for guidance only.
3.3 Design. Submachineguns and parts shall conform to the
design specified by drawing 9327045 and drawings applicable thereto
and be in accordance with the applicable design provisions of
MIL-W-13855.
3.3.1 Upper receiver and lower receiver groups. The upper
receiver group shall be attached to the lower receiver group by the
pivot pin and shall be held securely in the closed position by the
takedown pin. When the takedown pin and pivot pin are withdrawn to
the stop position, the upper receiver group shall disassemble from
the lower receiver group.
3.3.2 Lower receiver group
3.3.2.1 Triqger, trigger extension and sear. The trigger when
pulled shall act on the trigger extension which will release the
sear and actuate firing action, After partial or completed trigger
pull, the trigger shall return to its normal forward positions
(locked and unlocked) under spring action.
3.3.2.2 Trigger guard. The trigger guard shall pivot on the
trigger guard pin through its full range of travel. The trigger
guard shall be retained in the closed position by the trigger guard
spring loaded detent, and when in the open position it shall remain
open against the pistol grip without manual assistance.
3
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