The FP-45 Liberator is a single-shot, .45 caliber pistol designed for mass production and clandestine use by resistance fighters in WWII. Its simple construction involves a stamped steel breech block and a basic trigger mechanism. Unloading requires manual removal of the spent casing using a stick or wire, as it lacks an extractor.
The M3 and M3A1 Grease Guns were developed as a cost-effective, mass-producible alternative to the Thompson SMG during WWII. Designed by George Hyde and Frederick Sampson, these stamped sheet metal submachine guns featured a low rate of fire for controllability and a simple design. Despite initial magazine issues, the M3A1 improved upon the original, and the Grease Gun remained in US service until 1992, valued by tank and truck crews.
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