An AOW is an "Any Other Weapon".  These are restricted firearms under the NFA act of 1936, but can generally be purchased in most states and can still be manufactured today for sale to civilians.  The most popular AOW's today are short-barreled, or "sawed off", non-shouldered shotguns (they are NOT sawn, don't worry). We carry the most popular short-barreled shotgun pistols today.  Short-barrel shotguns with a stock are known as Short Barrel Shotguns, not AOWs.  You can't pack more concealable firepower into a small space that a shorty 12 gauge shotgun.