PTS MEC R-Type Piston Head for Marui PX4, FN 5-7, Model 17 Gen.4, Model 19 / WE Model 17

PTS MEC R-Type Piston Head for Marui PX4, FN 5-7, Model 17 Gen.4, Model 19 / WE Model 17 Metal Construction Design For Replace the Original Parts Also better suited to deal with the prolonged rigors of green gas usage Suitable for Tokyo Marui PX4, FN 5-7, Model 17 Gen.4, Model 19 / WE Model 17 Series Airsoft Gas Blow Back GBB Pistol