Drawing inspiration from the British STEN gun, the M3 was developed as a high-speed, low-cost substitute for the Thompson family of submachine guns. While lacking the aesthetic charm of the Thompson, the M3 was a serviceable weapon and would be America's go-to SMG through World War II and following conflicts. The A1 variant further simplified the design, eliminating the ratcheting cocking lever in favor of the operator cocking the bolt by hand, along with other improvements to reduce weight, improve reliability, and make maintenance easier. Blade front and peep rear sights, with the model nomenclature and Guide Lamp markings on the left side of the magazine well, integral oiler in the pistol grip, the combination dust cover and safety on top and a telescoping buttstock, which doubles as a magazine loading tool and barrel bushing wrench. One unmarked magazine is included.