STL file Hi-Capa HPA/M4 Adapter・3D printer design to download・Cults
Hi-Capa M4 HPA Adapter Lower by captaINstraiTJacket | Download free STL model | Printables.com
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