Because of the two primary weapon system it makes it harder to switch weapons on mouse wheel. When Im in a tight situation my secondary/second primary is almost always skipped over, and this more often than not causes unnecessary death in a fight that should be mine. This is why there should be an option to map your primary and your secondary to the up and down function on the mouse wheel. This why you will only get one gun or the other. Just putting it out there, as this would most likely be a much easier fix.