ITP Armorer Works WE GBB Drum Magazine Adapter For VFC AR M4 Series GBB Rifles AirsoftITP Armorer Works WE GBB Drum Magazine Adapter For VFC AR M4 Series GBB Rifles. Made out of metal. Comes with the magazine adaptor and HPA Adaptor., users can use either green gas or HPA. DOES NOT COME WITH THE WE Armorer Works M4 GAS DRUM MAGAZINE. Allows users to use the WE Armorer Works AW 350rd gas drum magazines with the VFC M4 AR15 series GBB rifles. To use this adaptor for your VFC M4 AR15 series GBB Rifles, you will need to have a WE Armorer