As with every naa mini-revolver the hammer need not rest on an empty chamber.Using the original half-way notch cylinder the hammer may rest safely and securely without chance of accidental discharge.The.22 magnum can be used with all popular.22 magnum ammunition including.22 magnum shot shells.Frame Description: Stainless SteelType: RevolverAction: SAOCaliber: 22 WMRBarrel Length: 1.63"Capacity: 5Hammer Style: ExposedGrips: Black RubberSights: Half MoonWeight: 4.50 ozFrame Size: CompactCylinder Finish: StainlessBarrel Finish: StainlessOal: 5.25"Barrel Length Range: 1" to 1.99"Weight Range: 3 oz to 8.99 oz