A closed-bolt, blowback-operated submachine gun, the Reising Model 50 saw action with the U.S. Marines in the Pacific as a substitute for the M1 Thompson, though they found their best success as defensive weapons for war-essential industries and as patrol carbines for American police forces. Blade front and elevation adjustable peep rear sights, with a flash hider/muzzle brake, cooling fins on the "PH" marked barrel, three-line Worcester address near the ejection port, and three-position selector/safety on the right side. "L.P.D. #5" has been added to the left side of the receiver, likely the rack/inventory number of the Lyons, Illinois police department. Smooth pistol grip stock with a cocking lever on the underside and a lightly ribbed buttplate. An extra magazine is included; both mags are the restricted capacity, single-stack pattern, but the magazine well will accept full capacity magazines.