Auto Rifle
From Destinypedia, the Destiny wiki
There is more information available on this subject at Auto Rifle on the English Wikipedia.
An Auto rifle is a class of firearm featured in Destiny. Auto rifles are magazine-fed weapons that, as its name suggests, automatically removes the spent cartridge case, cocks the rifle, loads a new cartridge and fires again repeatedly, as long as the trigger is held down or until the magazine is exhausted. Automatic rifles are distinguished from scout and pulse rifles in their ability to fire constantly once the trigger is pulled.