chrome plated parts?

[ssgross]

here is the bolt...may be a more definitive reference. The yellow could be dried grease/oil or could be the under-plating showing through.
Attachment 116774

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[browningautorifle]

here is the bolt

I still think that's plated... If you get it just take a swipe with cold blue in a wide open place and see. You can always re polish it after.