KCI mag question regarding bolt hold open

[W5USMC]

I'm not sure if it would be"hard"on the bolt in my opinion, but it does mar and scratch up the face of the bolt.

Not possible that it would mar or scratch the face of the bolt because the hold open follower does not come in contact with the face of the bolt. It comes in contact with the same bottom ramp portion of the bolt that pushes rounds out of the mag and into the chamber.