These are cool.
I'd be neat if you animated them, then showed them in a video.
Anyway, nice job!
Most animation I can think of that would be possible, would be;
trigger pull for all guns
bolt action on the sniper, emitters + projectile, new round entering chamber
rocket launcher firing, emitters + projectile
general projectile + emitters for all the others.
Animating the pump on the shotgun wouldn't be possible with the bricks I have there, unless I made the entire thing a round brick and then just used relays with colors.