What ever happened to the idea that it is not the weapon but the intent? Want to make pitbull harmless? Stop breeding them with over aggressive breeds like Chihuahuas, eliminating the race.
A gun can't go off on its own. A pitbull will. And, they were bred to fight from day one. Even some of the rescue groups will admit that.
They're wild animals that shouldnt be among civilization and should be put down. Every single one of them.