AMG Gas Magazine High Output Valve For Umarex/ VFC UMP Airsoft Rifle

AMG Gas Magazine High Output Valve For Umarex/ VFC UMP Airsoft Rifle CNC Aluminum Construction Airsoft High Output Valve Design For Replace the Original Output Valve Increase in performance and power output when installed Suitable For Umarex/ VFC UMP Gas Blow Back GBB Airsoft Rifle