The weapon was not truly a "silent" weapon for it still managed the standard, low-velocity .45 ACP cartridge - inherently subsonic but still producing a telltale sound. The suppressor aided some in retarding the operator's sound profile but the combination was not efficient. The remainder of the gun was largely unchanged and included the standalone pistol grip, collapsing twin-strut wire buttstock, tubular receiver and 30-round straight box detachable magazine which doubled as the forward grip. .
The OSS commissioned for some 1,000 suppressed M3A1s which certainly limited their overall reach in World War 2. Their suppression qualities proved poorer than the excellently-suppressed competing British STEN submachine guns - some 20% more audible than the British design.
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