Universal APACHE Tappetless Cylinder Head/ NozzleHow does a perfect seal and no tappet plate or return spring sound? Well to Aztech Innovations it sounded pretty damn amazing. Here it is, the APACHE! The first of its kind in the world, all air controlled driven by the piston. No mechanical forks or prongs to retract the nozzles No timing issues No broken return springs No broken tappet plates and best of all no fps droop on high rate of fire. The all in one sealed cylinder head ensures perfect seal