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I`m sticking with my original thoughts. Looks like edge of mag box to me. Some pretty knowledgeable guys on here to help you out though.

Welcome. Are you sure the "chatter" marks are from the ramp, and not the top front edge of the mag box? Could need to work it down just a touch. My .02
Welcome. Are you sure the "chatter" marks are from the ramp, and not the top front edge of the mag box? Could need to work it down just a touch. My .02
 
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I myself would not worry about a warranty I would send it to someone local have them polish the feed ramp maybe try to tune the mag a little before that although a plastic mag is hard to deal with
 
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