The 8.375" Model 48 K-22 Masterpiece MRF is the rarest standard production K-22 WMR configuration. Produced in very limited quantities for competition shooters, it is the scarcest barrel length in the .22 WMR K-Frame lineup. Type: Revolver Action: Double-Action Caliber: 22 WMR Capacity: 6 Year introduced: 1962, USA Weight: 42 oz Overall length: 13.5" Status: Discontinued Intended use: Competition / Target