Hi guys, i'm newbie here. i recently had one of my pistol slide cerakoted with graphite black. after a week, the guy told me it was finish. The pic below on the left with before mark is when it just finished paint. The one on the right is after i shoot it at the range. My question is, is it normal that inside the slide there are marks and scratches like that ? i mean i know there are friction inside when we shoot, but i heard cerakote is "strong". how strong and how normal is it to have that scratch inside the slide just by shooting it a few rounds ?