Way more than that. The AA12 is a machine gun, made AFTER May '86 so not transferrable to individuals. First you would need to become a Class III dealer, get a request to demonstrate letter from an LE agency to even obtain one. OR, you could just buy your own city, form a police department and buy one for the agency.
In life, strive to take the high road....It offers a better field of fire.
"Robo is right" Fuzzball