Kuba_T1000 AEG to HPA parts

I took the design by Kuba_T1000 for an AEG to HPA conversion and put it in openscad.
I take zero credit for this and I have not even tried it myself yet! I just want to print it to test out ideas.
http://kuba-t1000.com/minigun/index.php?akcja=tutorials_airsoft_aeg_to_hpa_conversion_mod_drop_in_gearbox_step_2