Action: SA/DA – Caliber: .357 Magnum / .38 S&W Special +P – Capacity: 6 – Finish: Stainless – Material: Steel – Grips: Black Synthetic – Sights: Red Ramp / White Outline Adjustable – Barrel Length: 4.25 – Overall Length: 9.6875 – Weight: 36.6 oz – Return of the K-Frame .357 Magnum – Full Top Strap and Barrel Serration – Ball-Detent Lock-Up – 2-Piece Barrel – 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 is available in .22 LR and .38 S&W Special.