Wear patterns on correct M1

[SRiverrat11]

I have this M1 that is "correct" according to Scott Duff's book, but the extractor, rear sight cover, op rod have a lot more parkerizing than the rest of the rifle around the chamber. Could this "wear" be normal? Or is it obvious these parts have been replaced? I am not an expert, but would appreciate opinions from those much more knowledgeable than me. Thank You.

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