VFC Piston Base Assembly for Umarex / VFC Glock 17 Gen 3 / Gen 4 GBB

VFC Piston Base Assembly for Umarex / VFC Glock 17 Gen 3 / Gen 4 Design For Replace the Original Parts Suitable for Umarex / VFC Glock 17 Gen 3 / Gen 4 Gas Blow Back GBB Pistol