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 break, cooling fins on the barrel, three-line Worcester address near the ejection port, and three-position selector/safety on the right side. The top of the receiver has been modified, with the area under the rear sight machined out, drilled and tapped to accept an optics rail; said rail, fitted with a Ruko Electro Bigdot sight, is included but not attached. Smooth pistol grip stock with a cocking lever on the underside and a lightly ribbed buttplate. Included with the SMG are four extra magazines, three single-stack and one double-stack, and a Korean-marked green canvas sling.

Very fine, with 85% plus arsenal refurbished gray parkerized finish, showing some handling marks and edge wear overall, with heavier tool marks on the underside of the receiver. The stock is also very fine, with mild dings and dents. Mechanically excellent. NOTE: This weapon is a National Firearms Act (NFA), fully transferable Class 3, which is registered with the Bureau of Alcohol, Tobacco, Firearms and Explosives, (BATFE) that is classified as a "Curios or Relic" as defined in 27 CFR, 478.11. These weapons are still subject to the provisions of 18 U.S.C. Chapter 44 and 27 CFR part 478.