The NAA Companion is a percussion (cap & ball) .22 caliber or .22 magnum caliber five shot revolver, engineered by the legendary gun designer, Dick Casull. The Companion uses a #11 Percussion Cap and FFFFH or Pyrodex powder. The NAA Companion is available for sale without going through an FFL Dealer in the United States because it is a black powder firearm. However, you will need to fill out the Cap & Ball waiver form and send NAA the Cap and Ball Waiver Form. if your residence is in: District of Columbia, Illinois, Michigan, New Jersey, New York, Rhode Island, or Washington. The Companion is compatible with the grips, holsters and other accessories for the NAA .22 LR Mini-Revolver. The Super Companion is compatible with the grips, holsters and other accessories for the NAA .22 Magnum Mini-Revolver.Both models use .22 Caliber Cap & Ball bullets, available from NAA.