An MP5 submachine gun
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. Officer Kurtis Stryker and Jax Briggs also used this weapon in Mortal Kombat: Armageddon and Mortal Kombat vs. DC Universe (in the case of Jax) .
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, offering them to Shao Kahn, Shang Tsung and the Tarkata, aiding them in the Konqueror's new war on Earthrealm.