The K-Frame revolver is one of the most important innovations in Smith & Wesson history and was built specifically to handle the .38 S&W Special cartridge. Since its introduction in 1899, the K-Frame has been a favorite for military and police professionals as well as target shooters and enthusiasts. Today's K-Frame, including the Model 66 Combat Magnum, has added features that make it even more dependable and fun to shoot. These new features include: a full top strap and barrel serration, a ball-detent Lock-Up, and a two-piece barrel. The adjustable white outline rear sight and red ramp front sight make it easy to zero in on your target.