PSS VSR Upgraded Hop unit - Gold

PSS VSR Upgraded Hop unit - Gold The chamber which developed for improving the accuracy of VSR-1. Developing the chamber bucking which extended 12.5mm more than genuine to prevent the air-loss with Air-seal SUS ring. Using HOP lever of G-SPEC type and expanding the HOP adjusting range, it makes exact HOP adjusting possible. *Please note that: for best results please Prometheus EG inner barrel with this product Takes AEG style barrel