PDI VSR-10 Hard Piston (2021 updated version)

This is a VSR-10 Stainless Steel and Delrin Hard Piston from PDI Japan. 《product description》 Head is the intake air type. When the piston travels forward, the O-ring expands. There is no clearance for Cylinder, so it's airtight. The features 1.Inner Diameter is about 13.5mm 2. Several Materials….Head & Body(Aluminum alloy) / End ring (Delrin) / End (Stainless) If using this piston use PDI-SPRING(SS,SPR,SPR-V), Normal Spring Guide is not abailable. Please use 9mm SPRING GUIDE. Caution: This piston is made for PDI-Precision cylinder. ※If using this piston to extreme power spring as PDI SS,SPR & over 2J setting, it’s possible to shorten the life of the parts. * Our piston design was changed in January 2021 Design changes: ・ Piston head design changed ・ Piston body design changed ・ There is no difference in the materials used. ・ Although there have been design changes, it has been confirmed by tests that the FPS is the same as the previous design. 《SPEC》 ■Usable gun：Tokyo Marui VSR-10