North American Arms' .22 Magnum Mini-Revolvers are the ultimate in up front, personal, close-in protection. It's small, easy to conceal, and safe to carry. The .22 Mag Black Widow can be used with all popular .22 Magnum ammunition, including .22 Magnum shot shells. 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.