creeper concepts glock aap hpa adapter til m4 mags gen 3BO Manufacture, together with Creeper Concepts, has made this 3D printed HPA Adapter so you can mount M4 magazines in your Glock AAP pistol. It is printed on a special Nylon Sintering Printing (SLS Technology) which is required by FCC, AirQB and SpeedQB. It comes with a US HPA Tap But a pistol magazine is not included, you have to get that and put it on yourself!