Yes, mine has some wear there too.
Inside on the top of the receiver, there are a few spots where the anodizing wore off. It's an aluminum receiver, so it's going to wear some. Unless there are visibly deep gouges into the metal, and just not the finish worn off, I wouldn't worry. Yours looks similar to mine, but can't really tell from your pics.
Inside on the top of the receiver, there are a few spots where the anodizing wore off. It's an aluminum receiver, so it's going to wear some. Unless there are visibly deep gouges into the metal, and just not the finish worn off, I wouldn't worry. Yours looks similar to mine, but can't really tell from your pics.