North American Arms (NAA) NAA-22MC-HG Mini-Revolver 5RD 22LR/22

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).