Introduced in 1935 by Charles J. Manville the "Manville Gun" was designed to fire flare, smoke, and riot gas shells from its 24 round clockwork drum. Mechanically, the Manville bears a strong resemblance to the later "Arnsel Striker/Street Sweeper" shotgun and modern less-than-lethal weapons like the Arwen, though not integrating a double action trigger. The two halves of the unit are held together with a pair of thumb screws, the barrel section marked "M 12 154" with a smooth pistol grip and the rear section having a checkered grip with "M" stamps and the Manville marking on top. A manual cocking mechanism is installed on the rear, and an internal spring-loaded sprocket provides power to the drum, with each chamber having its own firing pin.