Welcome to the forum.
Although it might be paint (ie; Duracoat, Ceracoat, KG gunkote, etc), it also looks like industrial hard chrome (not nickel but might be???) and HC is what I think it is. Reason being, mainly corrosion resistance but also has other advertised positives properties. HC for guns can be researched under different brand names; Armaloy, Metaloy, Robar NP3, are a few.
ETA:
Nice looking 28.
HC typically isn't cheap and although I'd prefer an original factory finish, some prefer HC to SS.
Last edited by jack the toad; 06-16-2018 at 12:26 PM.
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