Has it ever been tried all across the US? And then has it been enforced vigorously? Nope. But the old Western Bans were and they worked right after the shooting and killing by the Marshals and Sheriffs stopped. Well, with the exception of Deadwood Dakota Territory where no one screwed with those Sheriffs, Marshals and Deputies as they knew they would be killed dead on the spot. In Dallas TX, the Town Marshal gave you one warning. If you ignored it, he shot you down with no warning. Didn't take people very long to stop carrying short arms.