STL file HiCapa to M4 - HPA Adapter 🔫・3D printing model to download・Cults
TM M4 MWS M4 Adapter - Tapp Airsoft
Primary Airsoft adapter installation tutorial HPA and M4 Glock + Hi capa - YouTube
I know a lot of people hate the Primary Airsoft adapters, but when it's 110° outside, a light kit is a life saver. Also a great first step into HPA : r/airsoft