From EPeS we have their MK2 GBB HPA Adaptor for M6 / Golden Eagle
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 M6 Thread / Golden Eagle M870 Gas Shotgun