Warner BrothersCalifornia Gov. Jerry Brown will soon decide whether to sign a bill that expands his state's "assault weapon" ban to cover any centerfire rifle with a detachable magazine. That's a very broad category, the National Rifle Association notes, since "millions of semi-automatic rifles have magazines that can be removed with the push of a button," including "classic hunting rifles like the Remington Woodsmaster, Browning BAR, and the Ruger 99/44, among many others." The actual language of the bill, S.B. 374, refers rather confusingly to "a semiautomatic centerfire rifle that does not have a fixed magazine with the capacity to...