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
STL file MK23 TO M4 HPA ADAPTER・3D printer model to download・Cults
HK Mark 23 Picatinny Rail Adapter--Tac-Laser Model-with Thumb Wheel
MK23 / SSX23 HPA/MP5 adapter with magazine – Primary Airsoft