In United States law, a Machine Gun is defined (in part) by The National Firearms Act of 1934, 26 U.S.C. § 5845(b) [1] as "... any weapon which shoots ... automatically more than one shot, without manual reloading, by a single function of the trigger."
priberam.pt
Dicionário Priberam da Língua Portuguesa. «Metralhadora». Consultado em 3 de março de 2012
