The big question on this is...would the manufacturers roll over and play good doggie or stand up and say, if we can't sell/manufacture to citizens, then we won't sell/manufacture to police or military. aka close willingly or be forced out at the end of a gun.
Remember the trigger locks?; They'd roll over like obedient puppies.
Also to be considered is that while its great that they support the American right of keeping and bearing arms; but not many would turn their backs on a segment that pretty much guarantees the sale of their products. Its a higher level of Fudd thinking, they really dont need the civilian market to survive.