I was cleaning my 870 today (after my first turkey hunt!) and noticed on the inside of the receiver behind the ejection port there is a groove being carved. I read what I could online and saw some people say that some extractors were installed that do not have the top edge beveled and this would cause the groove in the receiver.

Has anyone experienced this? I don't even know what I am looking for in terms of bevel vs no bevel on the extractor. Did you guys who had it just replace the extractor?

Thanks!