Concidering where the man is from and where the barrels were purchased I will make my guess. These must be a set of tubes built up by Herr Klunkermiester in his trials to build a double rifle.The timming is about right as I'm the sure much of the basement gunshop has been cleared out and these barrels would fit in the take the lot type of deal of ain't got a clue what it is items.If these are truly tubes by Russ then the value is priceless no matter what they fit.