I just go back from the range and noticed this wearing on the inside of my upper. The black coating is obviously worn off and I'm not sure if its started taking some of the aluminum with it. I've only shot 120 rounds through my gun and had no feed issues at all, in fact I've been surprised with how smooth it is. My only guess is that possibly the gas tube isnt exactly straight and its causing the bolt to rotate a bit as it slides on to the tube. Is this something to worry about? I was about to loctite the screws of my rail down but now I'm not sure if I'm going to need to remove the rail and reposition the gas block . Any thoughts?
In case its relevant, this is a custom build so the parts are from multiple manufacturers.
Barrel: Daniel defense
Upper Reciever: Bushmaster