This is an very fine example of a WWII General Motors M3 SMG as manifested at the GM/Guide Lamp Division. These were developed circa 1941-1942 as a wartime substitute for the Thompson M1928 SMGs due to their lower cost and manufacturing time. The majority of these weapons were converted to the "A1" configuration after 1944; however, this example remains in its mostly all original configuration, with the cocking handle on the right side and original combination safety/dust cover. It has the fixed front and rear sights on top of the receiver. The left side of the magazine well is marked "SUB-MACH GUN/CAL. 45 M3" over the Guide Lamp marking and "Crossed Cannon/U.S. NO/185770"; some of these markings are covered by a protective bar mounted over the magazine catch. The underside of the trigger guard bow and the trigger housing cover both have Guide Lamp part markings of "BGR-GL/B6-301456 " and "G.L. C153432" respectively. It has a telescoping wire stock and comes with four original 30 round stick magazines.