Guarder Enhanced Hop-Up Chamber Set for Marui G17 Gen4 Airsoft GBB Pistol

Guarder Enhanced Hop-Up Chamber Set for Marui G17 Gen4 Airsoft GBB Pistol Aluminum Construction (Hard Anodic Coating Process) Design For Upgrade the Original Parts More Durable Suitable For Tokyo Marui G17 Gen4 Series Gas Blow Back GBB Pistol Airsoft Guns