The Ruger GP100 Double-Action Revolvers are among the most comfortable shooting revolvers. The triple-locking cylinder is locked into the frame at the front"" rear and bottom for more positive alignment and dependable operation shot after shot. It's patented grip frame design easily accommodates a wide variety of custom grips and the patented transfer bar mechanism provides an unparalleled measure of security against accidental discharge. With no special tools required"" maintenance and assembly is easy.