Have used it on smoke poles with SS.Both my inlines and 44 mag have synthetic grips/stocks.It will do a number on the stock if not wiped off ASAP.Its powerful cleaner(much more than carb cleaner) on any SS gun with stock assy removed.It will promptly remove paint from engine and all but ruin vac hoses - so - I guess it would damage blueing in short order??

Good Info - I'll make sure I never use it on or around bluing.