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with the rubbing on the part of the brass tube.. it looks like it is either bent slightly, or the whole unit itself (inner barrel, hop up, and brass tube) is not seated quite right, I would take the whole thing apart and give everything a good look over, take it apart, clean it, reseat everything properly and then reasemble it, because that you got it used and in a totally different configuration then stock, this is quite possible. As for the rubbing on the black tube and the white spacer, that is normal, hell you should see my AWSS WE its worn to shit and still kicking. If you don't have too stay with the Closed bolt unit (unless the brass tube is bent then you have no choice).
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