I can only recall seeing pics of a very few original cased sets of percussion Colts with more than one barrel of different lengths. It would seem to me that with the barrels being so easily interchangable it would have been easy to make sets with long and short barrels for, say, an 1851 Navy. Say 3-5" for pocket, 7-8" for holster, and 12-16" for using with that shoulder stock. Any ideas as to why this was not done?