Ruger SP101, Double/Single Action, Revolver, Small Frame, 357 Magnum, 2.25 Barrel, Alloy Steel, Blued Finish, Rubber Grips with Wood Inlay, Black Ramp Front and Fixed Rear Sights, 5 Rounds 15702 The Ruger SP101 transfer bar mechanism provides an unparalleled measure of security against accidental discharge. Triple-locking cylinder is locked into the frame at the front, rear and bottom for more positive alignment and dependable operation shot after shot.