Airsoft M4 Mag Extension

Had a request for a airsoft AEG M4 mag extension. It only works on AEG M4 type airsoft, it will not work with a airsoft M4 GBBR. It might be tight in the mag well and adapter on the mag. The print settings I used, ABS, 0.3 mm layer height, 2 shells, 10% infill, 230 C and with supports enabled.