GHK Gas Blow back AK74U Barrel

I want to change Inner Barrel 6.03mm-6.04mm. But I have asked many gunshop in Mongkok, no one can answer to me how to change and the barrel is using AEG Series or not

Any c-hing can help me. Many THANKS

[ 本帖最後由 m913282 於 25-1-2009 03:22 編輯 ]