long shot here- but i had a set of barrels I browned that were doing that- oiled them several times, in a week or so the light rust was back.
then I degreased them, rubbed them down with a thick paste of baking soda and water (to neutralize any left over solution) cleaned and dried them and lightly oiled them- no rust has come back in months now
of course- if it was just redone- you might want to contact the person who blued it, see what they say
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"If there is a heaven it must have thinning aspen gold, and flighting woodcock, and a bird dog" GBE
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