Colt Automatic Rifle is a 5.56 mm NATO firearm offered by Colt Defense. It is based of the M16A2/A4, but features full automatic fire, an integrated bipod, and it can be configured to fire from an open bolt. The forward hand-grip has a distinctive squared off shape.
It is one of many SAW-type firearms that have been developed from the AR-15. Others include the Colt CMG-1 machine gun and CAR-15 Heavy Assault Rifle.