I had to pour 4 ozs of whiskey down the old mans throat to get him to quit laffing about wandering alien visitors buying machine guns. Especially when most so called machine guns are actually SUBmachine guns.
That question should be the poser... who knows the difference?!?
But yes I guess you could buy one oit of some ones car trunk... now sneaking it back in to another country could be a little tough... Legally?! Not a freaking chance .