A Machine Gun is a fully automatic mounted or portable firearm, usually designed to fire rounds in quick succession from an ammunition belt or large-capacity magazine, typically at a rate of several hundred rounds per minute so long as the trigger is held down. It is not a select-fire weapon; machine guns are usually full auto only.
In Mortal Kombat
Machine guns are used by police and military forces in Earthrealm. Jax Briggs has been known to use a Machine Gun in many of his appearances throughout the franchise. Officer Kurtis Stryker also had the weapon in Mortal Kombat: Armageddon.
In the storyline of Mortal Kombat (2011), Kano and his Black Dragon thugs stole a large number of high-tech weapons including machine guns and rocket launchers, and sold them to Shao Kahn, Shang Tsung and the Tarkata, aiding them in the Konqueror's new war on Earthrealm.