The Model 648 is a stainless K-frame revolver chambered in .22 WMR (Winchester Magnum Rimfire), providing significantly more power than .22 LR in the same platform size. The 8-shot cylinder takes advantage of the slimmer .22 WMR case diameter. Useful for small game, pest control, and as a trail gun where a larger caliber revolver would be impractical. Type: Revolver Action: Double-Action Caliber: .22 WMR Capacity: 8 Year introduced: 1988, USA Weight: 41 oz Overall length: 11.25" Status: Discontinued Intended use: hunting, target, training