Mine has these as well, very small chips every few cm along the underside and the front strap of the grip, I think you might be right about the battle worn / distraction idea. I did not notice it till I read your post and checked.
I only seem to get 24 rounds in my mags, I am loading from the bottom, I haven't counted when using my plunger loader from the top. If I didn't have to go to bed I'd go and check now It will have to wait till this afternoon.