North American Arms 22MSCP: NAA\'s .22 Magnum Ported mini-revolver is the ultimate in up front, personal, close-in protection. It\'s small, easy to conceal and safe to carry, using the half-way notch cylinder so the hammer may rest safely and securely away from live or empty chambers without chance of accidental discharge. The 22 Mag cylinder can be used with all popular .22 Magnum ammunition, including .22 Magnum shotshells (called Snake Shot by some manufacturers). This model has a ported barrel and comes with a special 22LR conversion cylinder made longer to easily fit in the.22 Magnum mini-revolver.