This H&R Reising Model 50 submachine gun is chambered in 45 ACP. The Reising Model 50 saw limited early use by the U.S. Marines in the Pacific as a substitute for the M1 Thompson, eventually being replaced by the M3/M3A1 SMGs. These desirable commercial models feature a better high polish blue finish with a nicely varnished walnut stock. They were used extensively by State Police/Sheriffs and other law enforcement agencies in the mid to late 1940s throughout the 1950s. They were a blow-back operated designed which had the cocking handle located in a cutout on the underside of the forend. The markings are read from the right side of the receiver, from the back to the front as follows: "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: "12767" and "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 a threaded on 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 with the sling swivels on the side of the stock. It comes with a green M1 carbine type web sling, four original 20 round stick magazines ( all four are marked H&R REISING), seven extra firing pins and three spare internal springs and an instruction manual.