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Are you certain it is the magazine lips that are scraping?

Just trying to help isolate the issue....

On AR15s, a certain amount of initial wear is to be expected, especially if the owner assembled it himself and not a factory with all same-brand parts. Since this is the case with your rifle (assembled at the factory), signifiant wear is generally not a good sign. In may be the mags, it may be tolerances between the bolt and other components. A pic would be very helpful!
 

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Oh, and remember, some wear is normal, excessive wear is not.

Did you clean and oil it before shooting? Some guns are shipped with a coating (or an application) of thick oil/grease, meant as a rust preventative and not specifically as a lubricant. This needs to be removed, weapon cleaned, and properly lubricated before shooting.

To test if wear spots still remain, get some dry erase markers (or sharpies) and mark the current areas of wear. Dry-fire or test fire, then examine the marked areas; you will notice immediately if the wear spots remain. Also an effective way of identifying what the part is rubbing on!

And finally: remember that all weapons need to be broken-in when new. This could be an little as a hundred rounds or so, or as many as 3-500 rounds. Break in your barrel carefully (is it chrome-lined?).
 
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