"Wear" is normal.
"Chipping" is not normal.
Well, I pulled the rifle out of my car rack and looked inside. My wear/chips looks just like your. My pic isn't as nice since I did not open the rifle up but you get the idea. The wear showed up immediately after I sharted shooting it but it hasn't gotten any worse in the 3,000rds that I've put thru it. No worries.
How do I check for an out of spec bcg?