I just got my rifle together last week. I went out last week and put 60 rds thru it before work. I went to the range Sat and put about 150 more thru it. I got home and started to clean it and noticed some bare metal spots inside the upper. Is this normal wear and tear or something I should be concerned about?
Here are some pics of what I am talking about.
This is the main spot that I noticed first. (First 2 pics)