M3 and M3A1 Grease Gun SMGs
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.









