-a is available in the game mall, -red should be limited time but it should not be available now, and -b has no impression. I think the reason why you like to use AUG is because its sight is small, but AUG has many shortcomings. The biggest one is the reload speed. Even -a is not very fast. Secondly, the ballistic trajectory is not very stable, not as good as M4, single-point headshot. Not as good as ak, I personally don’t like it very much.