Ruger, GP100 Standard, Double Action, Revolver, 357 Magnum, 4.2″ Barrel, Alloy Steel, Blued Finish, Hogue Monogrip, Ramp Front and Adjustable Rear Sights, 6 Rounds. Ruger’s GP100 revolver features a triple-locking cylinder that is locked into the frame at the front, rear and bottom for more positive alignment and dependable operation. Its patented transfer bar mechanism provides an unparalleled measure of security, while the integrated sub-assemblies allows for easy maintenance and assembly. The grip frame design easily accommodates a wide variety of custom grips. This Standard model has a stainless steel 3 barrel, frame, and cylinder. It also has a black Hogue Monogrip and a fiber optic front sight with an adjustable rear.