A machine gun is a fully automatic mounted or portable firearm, usually designed to fire bullets in quick succession from an ammunition belt or magazine. The usual fire rate is three to eighteen hundred rounds per minute.
Fully automatic weapons are usually called as submachine guns, machine guns, or autocannons. Submachine guns are hand-held automatic weapons for personal defense. A machine gun is often portable to a certain degree, but is can be used when attached to a mount or fired from the ground on a bipod or tripod, and generally fires a rifle cartridge and is capable of Continuous fire. Below: The original Maxim Machine Gun. This is the first Official Machine Gun. The one of the right is the maxim machine gun.This was used by both sides in the first world war.