1915 S&W Hand Ejector .455 Mark II

The Triple Lock, officially the Smith & Wesson .44 Hand Ejector 1st Model New Century, is a double-action revolver. It was and is considered by many, including handgun enthusiast and expert Elmer Keith, to be the finest revolver ever made.[1]

Its popular name refers to its extra (third) locking lug on the cylinder crane. This extra locking mechanism was deemed necessary due to the increased power of the .44 Special cartridge (a lengthened .44 Russian and the parent of the .44 Magnum), first chambered in the Triple Lock.[2]