Developed circa 1941-1942, the M3 was inspired by the British Sten SMG. Using the maximum amount of machine stamped components, the M3 could be made significantly faster (and by extension less expensively) than the M1 Thompson. In 1944 the "A1" variant was introduced, further refining and simplifying the design. Though withdrawn from overall service in 1957, the M3A1 was still issued to vehicle crews as late as the First Gulf War, and examples upgraded with modern mounting rails and suppressors are being issued to members of the Philippine Marines. Fixed blade front and peep rear sights, with a combination dust cover and safety on top, a shielded magazine release button on the left side, and the nomenclature, address, and serial number on the magazine well. The grip is stamped in a checkered pattern, with a built-in oiler, a green canvas sling, and a telescoping wire stock that also serves as a loading and disassembly tool. Included with the SMG is an extra barrel, a spare bolt, three extra magazines and one transparent plastic magazine cover.