Below are two pictures. I noticed yesterday, I had a couple of stove pipes that I blamed on the ammo and the federal ammo. I broke it down and was looking in the receiver and found this spot. It's rough and I think I need to address it. Its at the top of the pictures center. You can see the shiny wear and its barbed and rough. Wanted input before I take a dremel to it to smooth it out. Opinions PLEASE! I've seen YT vids on things like this but not exactly this.