M1 Thompson

M1-a simplified version of the M1928 model created to reduce production during wartime. Released in 1942. Had the automatic blowback, the loader on the right side of the receiver, a wooden handguard, barrel without fins and compensator. used only with the box, fixed iron sights rear sight. An even more simplified version of the M1a1 model 1943 year had a fixed firing pin instead of rolling.