The Ruger GP100 features triple-locking cylinder is locked into the frame at the front, rear and bottom for more positive alignment and dependable operation shot after shot. The GP100 grip frame design easily accommodates a wide variety of custom grips. Disassembly of integrated subassemblies requires no special tools and allows for easy maintenance and assembly. The Ruger transfer bar mechanism provides an unparalleled measure of security against accidental discharge.