Numerical designation S&W placed on the "K-22" in 1957. Target model .22 rimfire revolver popular since its introduction in 1946. Offered in 4-, 6- and 8.375-in. barrel lengths, with all target options. The 8.375" barrel dropped from the product line in 1993. Finish blued, with checkered walnut grips. Nine engineering changes. 6-shot CNC frame in modern Heritage Series.