A definitive study of the 1994 law – which prohibited the manufacture and sale of semiautomatic guns with “military-style features” such pistol grips or bayonet mounts as well as magazines holding more than ten rounds of ammunition – found no evidence that it had reduced overall gun crime or made shootings less lethal. “We cannot clearly credit the ban with any of the nation’s recent drop in gun violence,” the Department of Justice-funded study concluded in 2004. “Should it be renewed, the ban’s effects on gun violence are likely to be small at best and perhaps too small for reliable measurement.”