Something I've noticed has been bugging me a bit, the way the shells eject our of the guns is FAR too uniform, they have almost no spin or change in direction and it makes them look robotic and boring, I might just be picky but I think a change to how the eject could make gunplay just a bit more immersive and that's rarely a bad thing...
Here's a good example of how they actually behave: https://www.youtube.com/watch?v=W4oYuYGMwdw
As I said, I might just be a picky asshole so feel free to disregard my suggestion if you think it's ridiculous...
Keep up the great work guys, love ya ~Jeri