The only double barrel AR AEG in the airsoft market, the Classic Army DT4 Double Barrel AR or known as the "Double Trouble" AEG  is available at Gunfire... "Two barrels are better than one! Certainly, this was the main idea behind the Classic Army DT-4 Double Barrel AR carbine replica. This unique design is a combination of two AR15 type replicas. The model has been developed to offer double firepower while maintaining the convenience of operation. The use of a special gearbox allows simultaneous firing of both barrels. The whole mechanism is controlled by the advanced electronic system ECS. The replica is made entirely of metal, including steel elements such as the muzzle device or the ejector cover. Polymer parts are conveniently shaped pistol grip and a collapsible stock."