Action Army VSR-10 Hop Up Chamber. Upgrade your stock chamber with this CNC machined unit. Fits Tokyo Marui VSR-10 sniper rifles, Echo 1 PSR, clone guns, JG BAR-10, etc. We expect this chamber to be a great compliment to the Wolverine BOLT system once it's out too! The Action Army Hopup Chamber is a must-have for VSR sniper rifle users. Its easy installation and simple operation is a breeze compared to the PDI system. Highly recommended for custom rifles!***More units arrived 4/26/2016. Yes, we export VSR parts if you need us to ship international.