The Manville gun was a stockless, semi-automatic, revolver type gun, introduced in 1935 by Charles J. Manville. The Manville Gun was a large weapon, with a heavy cylinder being rotated for each shot by a clockwork-type spring. The spring was wound manually during the reloading. By 1938 Manville had introduced three different bore diameter versions of the gun, based on 12-gauge, 26.5-mm, or 37-mm shells. Due to poor sales, Manville guns ceased production in 1943.