Where the charging handle strikes the upper receiver it has made marks on both sides. It possibly has deformed the metal too. I will be able to see it better tomorrow when the sun is shining. I'll take photos then. Can anyone give me a hint whether this is really bad or not?

Nope, perfectly normal

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Isaiah 43:1-3

Thanks for the help.

Normal. Make sure you are keeping that lubed though, that helps. You can also get the charging handle rubbing on the castle nut sometimes too.

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Still carrying my S&W 642

Normal, but the amount of running varies from gun to gun.