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Can't see the chamber (that is the at the end of the barrel where the cartridge sits when the bolt is in battery).
Can see the inside of the receiver through the ejection port....and if you mean the rub marks on the far side of the receiver, I don't see a problem, IMO.
Most ARs like to be run wet (ample lubrication). Are you running yours with ample lubrication on the bolt, bolt carrier group, and the interior parts of the upper receiver?
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