Except for state laws-- usually california, no limits on ammo purchases. Purchase 5 million rounds if thats what you need for um, deer hunting. Nothing over 50 cal, but 50 cal is fine. Mount it on your pickup truck I guess. 50 cal ammo is 3 bucks per round for the cheap stuff so that adds up. Not a gun for the poors to own. You can own a tank if you want to also, but theres a lot of laws around making it street legal, depending on the tank’s weight.

Operating a tank is a paperwork nightmare, which is another reason why Americans are so cynical about their government.

(/s)