This stainless steel enhanced valve pin is manufactured by precision CNC machined. It fits T.Marui M870 series Shotgun and KSG Shotgun. This high flow design enhances shooting power about 12%; improves shooting accuracy; and increases shooting velocity. Stainless steel material avoids oxidization and provides outstanding durability and reliability. High quality and precision O-rings are installed for air-tightness. Extreme hard precision ‘Gas Outlet’ O-ring is included.