An autoloading firearm that is designed to fire continuously as long as the trigger is held down and there is ammunition in the magazine. In other words, with a single pull of the trigger and continuous pressure on it, a full-auto firearm (also commonly known as a “machine gun”) will continue to fire rounds in rapid succession until the ammunition is exhausted or the shooter releases the trigger. The same as a semi-auto, the mechanism relies on energy expelled with firing cartridges to create excess energy to automatically expend the spent casing and load another road from the magazine into the chamber. As with semi-auto guns, fully automatic firearms can be in the form of handguns, rifles or shotguns, although fully automatic shotguns are not very common.