Need to know exactly where that spec is in the bore.
Is it in both bores and where.
Do the bbl's need re-blue just for lack of color? Or are they pitted, etc and will need polishing (metal removed).
If the latter, I'd pass.
If it's just color, then it's possible to do that w/o striking, grit polishing, etc. It may not be the prettiest job ever. But it will have bluing back on it.
Plus what are the bore diameters of each bbl? Maybe it's been the recipient of an aggressive pit removal job in the bore(s) and that's where the thin tubes comes from.
If there are no clear answers,,then move on.
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