Machine gun
A machine gun is a firearm of military significance, often crew-served, which upon depression of the trigger automatically feeds and fires cartridges of rifle size or greater.
National Rifle Association of America’s Institute for Legislative Action (NRA-ILA) Glossary, http://www.nraila.org/glossary.aspx?s=Glossary&st=&ps=.
Last updated on: 01 February 2014