Although I'm relatively familiar with Ithaca doubles, there are people with WAY more expertise than I have. However, I would have known from one quick look at that set of barrels that they would not fit a Flues. Or, for that matter, any other Ithaca double I've ever seen. Anyone who claims to know Ithacas and who claimed that they'd fit . . . well, either they don't know Ithacas or else what they were selling was a bill of goods.