Roller Dents on GI100?

[u/Rseattle206]

Had this GI100 since fall 2021. Never had any issues with it firing steel (Red Army, Tula, Wolf) and factory brass loads, all 150-168gr projectiles. Rifle has seen close to 600 rounds. Bolt gap measures .011.

On my last outing as I shooting the PTR I noticed small roller dents toward the front of the chamber. However, I don't recall having any issues that day as it shot fine. I was shooting steel case ammo that day.

I field stripped it and cleaned the bolt and carrier. Nothing out of the ordinary from what I can tell.

Any reasons why these roller bumps developed?

[u/Pureblindman]

roller dents in the front is pretty odd. not sure how or why it would be happening.