Nine Ball Dyna Piston Head for Tokyo Marui Model 19 / 17 Gen 4 GBB Pistol

Nine Ball Dyna Piston Head for Tokyo Marui Model 19 / 17 Gen 4 GBB Pistol Metal Construction Design For Upgrade the Original Piston Head More Durable Suitable for Tokyo Marui Model 19/ 17 Gen4 Series Airsoft Gas Blow Back GBB Pistol