From EPeS we have their MK2 GBB HPA Adaptor for M5/WE/KJW/GHK/VFC
EPeS MK2 GBB HPA Adaptor
The EPeS MK2 GBB Adaptor allow you to utilise HPA to power your GasBlowBack replicas by replacing the gas input valve on the magazine/RIF with a US Type Foster Series 2 QD Male Fitting. They are designed and made in the Czech Republic from AlSi 304 Stainless with a blackened finish.
Thread Type: Standard M5 Thread / WE / KJW / GHK / VFC