Hello, everyone joined here recently. I just purchased my first HK in the last couple weeks. I have put about 300 rounds down the pipe. It is a great shooter in everyway, accurate, no failures of any kind. The question I have is this, I noticed on Fri when I finished shooting that on the inside upper edge of the ejection port there was what appeared to be some wear already or a glint I guess would be a better description. Is this normal? Is there a issue with the extractor and brass not clearing the port as it is ejected from the port? The wear is not bad but I notice it now that I have seen it.