California officials are vowing to fight back after a federal judge overturned the state’s 30-year-old ban on assault weapons. In ruling the ban unconstitutional, U.S. District Judge Roger Benitez compared the AR-15 semiautomatic rifle to a Swiss Army knife, calling it “good for both home and battle.”Benitez, of the Southern District of California, issued a permanent injunction against the law’s enforcement but stayed it for 30 days to give the state a chance to appeal. California is one of seven states, plus Washington, D.C, that ban assault weapons, according to the Brady Campaign to Prevent Gun Violence.