Smith & Wesson "N" to the largest .44 Magnum type frame. In 2003, the even larger "X" frame was introduced for the .500 S&W Magnum. Most Smith & Wesson revolvers have been equipped with an internal locking mechanism since the acquisition by Saf-T-Hammer. The mechanism is relatively unobtrusive, is activated with a special key, and renders the firearm inoperable. While the lock can simply be left disengaged, most gun enthusiasts prefer "pre-lock" guns. In 1953 the U.S. Army was looking for a pistol to replace the Colt 1911A1. To obtain a bid from the U.S. Government, Smith & Wesson began working on a
Smith & Wesson returned to his native Springfield, Massachusetts, while Wesson stayed on as plant manager with Volcanic Repeating Arms. As Samuel Colt's patent on the revolver was set to expire in 1856, Wesson began developing a prototype for a cartridge revolver. His research pointed out that a former Colt employee named Rollin White held the patent for a "Bored-through" cylinder, a component he would need for his invention. Wesson reconnected with Smith and the two partners approached White to manufacture a newly designed revolver-and-cartridge combination. Rather than make White a partner in their company, Smith and Wesson paid him a royalty of