The Colt AR-15 carbine is a semi-automatic rifle
chambered for fixed centerfire ammunition that fires one round each time the trigger is pulled. The weapon features a pistol grip and a flash suppressor.
The term assault weapon is used in the United States to define some types of firearms. Usually they have a detachable magazine, a pistol grip and sometimes other have a vertical forward grip, flash suppressor or barrel shroud. Some firearms are specified by name.