This is an excellent example of a WWII era Harrington & Richardson Reising Model 50 fully 45 ACP submachine gun. These weapons saw limited use with the United States Marines in the Pacific as a substitute for the M1 Thompson. However, they were more widely used as defensive weapons for war-essential industries and law enforcement agencies. The top of the receiver has the three-line Harrington & Richardson factory markings, with the fire control and serial number on the rear right side. The barrel is fitted with a combination flash hider/muzzle break with cooling fins on the barrel. It has a blade front and a stamped, sheet metal adjustable rear sight, with the cocking lever on the underside of the forend. The breech end of the barrel is stamped with "P" indicating the barrel was proof fired after assembly. It is fitted with a one-piece walnut buttstock with a smooth sheet metal buttplate. This weapon includes two original Reising Model 50 20 round stick magazines, a reproduction web sling, and the very scarce Police storage case. These storage cases were intended for the local Police and Sheriff to store the weapon, magazine and accessories in the trunk of their patrol cars to use when out in the field. A scarce item seldom found today. It has an all blued metal finish with a case hardened selector switch.