aa - 12 shotgun for sale . A blog with information about where to buy shotgun, which are the prices. Fire for self-defense shotgun, shotgun for various sports, guns for fun. Winchester AA 12 Gauge Once Fired Red Hulls. 5 Cents Per Hull. These Are The New AA Hulls. Grey Hulls Are Also Available At The Same Price. Mix Red And Grey If You Like. As we alluded to above, MPS, Inc. (Military Police Systems, Inc.), which manufactures and markets the AA - 12 Shotgun (Auto Assault- 12 Shotgun), may be teaming up with. Where can I get an AA - 12 shotgun? I like this gun alot,. Sorry..The AA12 is only being manufactured for sale to Law Enforcement Agencies and the. Military Police System Co(Tennessee, USA) that offers the slightly modified AA - 12 selective fired shotgun for authorized military and police users in USA.