This is the second, also obselete version of my fixed magazine system project. It's shown https://www.youtube.com/watch?v=hiqY-gEGKSc . It does work just fine, although it's kind a pain to get the springs on the doors secured and working. This sucks in both 0.1 and 0.2, I'm not sure which is worse.
This also uses the drum replacement spring from https://foamblastshop.com/product/nerf-replacement-drum-spring/ .