Wolverine Airsoft's STORM series InGrip regulator is the end-all solution to concealing a HPA regulator within an airsoft rifle. Specially designed to fit into most M4/V2 pistol grips, the InGrip regulator allows bot hthe usage of both HPA and CO2. When securely mounted within the pistol grip, this InGrip regulator connects the HPA engine to the tank via a standard paintball/airsoft remote line. The regulator iself has a simple two piece design that can be adjusted for pressures between 40 and 140 PSI. When installed inside the grip, the grip itself acts as a tournament lock. Because of it's design and the regulator's placement far from the tank and closer to the gun, the consistancy and recharge rate are maximized. By having the remote line between the tank and regulator acting as an expansion chamber allowing the use of CO2. CO2 is most cost efficient and lasts approximately 3 times longer than HPA.