Action: SA/DA - Caliber: .357 Magnum / .38 S&W Special +P - Capacity: 8 - 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.