Failed (kinda Just Gave Up on It Really...) Shell Ejecting Vector Mech

I will most likely try finishing this as some point... but admittedly my main work right now is on making a really functional m4 that looks nice and has an actual bolt. tell me what you think of this... or even steal it and finish it. I'd be flattered if someone did! I got as far as getting it to eject the shells reliably, but couldn't figure out a good propulsion mech that looked good... and I couldn't bring myself to make just another pin gun with the only plus being ejecting shells. have fun!