The Ninja V2 Pro SLP allows for on the fly adjustment of air pressure to HPA Airsoft Rifles with PolarStar Fusion Engines or the Valken V12. This regulator is fully adjustable between 450, 550, 700 & 800 PSI settings allowing the operator to fine tune their HPA rifle's FPS. Made out of high strength, lightweight aluminum. This regulator has a full 360 degree rotation. This lets you place the fill gauge and nipple in any direction. Ninja Pro Regulator has the Gen II SRT Piston which reduces and virtually eliminates any type of shootdown.