Fairly normal. Mine isn't as bad as what that looks in the photo, but it still has marks (as does my FNP-9, SIG P938 and even my 1911-although it's hard to tell since it is a stainless barrel). Pretty much any pistol where the barrel contacts the slide will show similar marks, although some are fitted better and don't show them as much or early on. There will be corresponding wear/polishing where the barrel goes through the hole in the slide. You'll also see a couple of shiny spots on top of the barrel hood.
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