This is an example of an H&R produced Reising Model 50 submachine gun chambered in 45 ACP. The Reising Model 50 saw limited use by the U.S. Marines in the Pacific as a substitute for the M1 Thompson, eventually being replaced by the M3/M3A1 SMGs. Many of these weapons were transferred to various law enforcement agencies in the late 1940s and early 1950s. They were a blow-back operated designed which had the cocking handle located in a cutout on the underside of the forend. This is a late model as the markings are read from the left side of the receiver, from the front to the back with: "MODEL 50 H&R REISING --- CAL 45/HARRINGTON & RICHARDSON ARMS CO./WORCHESTER MASS.U.S.A. PAT PENDING". The right rear side of the receiver is marked: "SAFE/SA/FA", for safe, semi-automatic and full automatic. They have a short, finned barrel to aid in cooling, similar to the Thompson, with an integral compensator/muzzle break on the end. They have a fixed front sight with a stamped sheet metal rear sight that is adjustable for elevation only. They have a one-piece pistol grip walnut stock with a flat sheet metal buttplate on the end with a parkerized finish on all the metal parts. It comes with three original H&R marked blued Model 50 magazines.