Finally finished printing a carbine kit for my mk23. HPA adapter by Primary Airsoft, 310mm Crazy Jet Barrel, as well as all the other standard mk23 upgrades. : r/airsoft
MK23 Shotgun Shell HPA Adapter — Airtac UK
STL file MK23 Socom to HPA Drum magazine Adapter・3D printable design to download・Cults
Mark 23 (HECKLER & KOCH) .45mm STEEL COMPENSATOR – MatchWeight
HK Mark 23 (SOCOM) Picatinny Rail Adapter (Tac-Laser Model)