Riesch's book says, "all bolts were rust blued or Du-Lite finished...." But he goes on to say, "Parkerized bolts were refinished during refurbishment." Where did the parkerized ones come from if ALL bolts were blued?

Reason I ask is that I am considering having my barreled receiver re-parked, and I would like to have the bolt refinished too, but not sure whether to have it parked or blued. Anyone?
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