As far as I know, the 50 is legal in Florida, only illegal in Kommiefornia.
I know of no fed law that prohibits them.
Gives ileagal status to the firearms and any one who possesses them.
Federal jail time felony.
The shooting range I go to is in FL. I once asked the firingline guy there if anyone ever brought in a Barrett .50 and he told me there were a couple of guys who would bring them in to shoot. He said everyone would stop and watch when they were fired. Said they were loud.