The Model 48 K-22 Masterpiece MRF (Magnum Rim Fire) is a K-Frame .22 WMR target revolver with adjustable sights. It bridges the performance gap between the .22 LR Model 17 and the centerfire service revolvers, offering more power than .22 LR in a familiar platform. Type: Revolver Action: Double-Action Caliber: 22 WMR Capacity: 6 Year introduced: 1959, USA Weight: 38.5 oz Overall length: 11.1" Status: Discontinued Intended use: Target / Field