Buy North American Arms (NAA) NAA-22MC-HG Mini-Revolver 5RD 22LR/22MAG 1.625″ w/ Holster online. 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.North American Arms’ .22 Magnum can be used with all popular .22 Magnum ammunition, including .22 Magnum shot shells (called Snake Shot by some manufacturers).