Valor Bound Studios show their Dual HPA Airsoft gun based on the CSI-XR5 AEG and powered with the PolarStar Fusion Engine... "Dual HPA Airsoft Gun, Dual Polarstar Fusion Engine in a 1st in the world CSI-XR5 Dual barrel aeg rifle build, why wait for the classic army DT4! This gun runs two mid cap no wind magazines and 2 of the red tip Polarstar Fusion Engines, the scope is centered so is the grip and both mages release with one button push.