Primary Airsoft Gen. 4 Hi Capa M4 HPA Adapter
Installation Tutorial: https://youtu.be/AydmykdSGSM
This adapter allows you to use HPA (high pressure air) and M4 AEG magazines on your Hi Capa airsoft pistol. The 4th generation Hi Capa M4 adapter is injection molded from a strong glass reinforced nylon material. The magazine release is built from CNC machined aluminum.