Harut Sukunyan

I just received an R1 rifle for my birthday and on the first day at the range, my father and I saw scratches appearing on the receiver behind the bolt. We were confused so we took it to our nearby range's pro shop, which is where we bought it from, and one of the gun experts took a look at it and informed us that the ejector/extractor, whatever you want to call it, was the problem. He told us that it caused the bullet to flip and scratch the receiver. If anybody knows more on this or can help in any way please help by posting comments on what I could do reduce it of end it. On my last trip to the range, i didnt really notice this. My final question is that do you think that i should get the gun replaced?