The bright side of that is that you can buy anything on the black market and the penalty is just the same. Full auto, RPG, grenades, ... you name it.
Thanks to the CIA the Mexican drug cartels were buying things like anti-aircraft artillery on the black market.
Well, guess my point really was more about prohibitions. Whenever the gubbamint tries to ban something, resourceful folks find a way.
Black market ammo will fill the vacuum. It’ll be expensive, but it’ll be available.