If you haven't shot it yet, I would take it back to the store and exchange it. I would definitely have a look at the chamber with a bore scope before I tried to chamber a round. My major question is "are the scratches coming from the magazine or from the chamber itself. One way to check is to top feed a round into the chamber and see if the bolt closes smoothly. If is doesn't with factory ammo, then don't fire it and return to the store.
Luck, Tim
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