Designed and manufactured in Italy, the FPS Softair XPPD piston head is CNC-machined from ultra-durable Polyoxymethylene (POM / Delrin) plastic. Built for low mechanical friction and reduced gearbox strain, it features a 6-port ventilation system paired with an upgraded X-Ring / double O-ring setup to achieve optimal compression and air sealing. It comes equipped with integrated ball bearings to prevent spring twist during rapid compression and includes a one-piece plastic shim for setting Angle of Engagement (AOE). 100% Tokyo Marui compatible.