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My basis is speculation isn't proof which there is a vast amount of "speculation" around here on ALLOT of topics. My references stem from that video, which old but is one of the finer examples that exist and a small passage I found which I'll post up when I get home later this evening. I believe there also is a reference of this on the American Pioneer Video series which highlights the process of forging a barrel. In short, my response was strictly based upon the amount of speculation which again IMO isn't definitive proof. I personally feel two forms of reference isn't all that convincing, however if the octagon profile was of great importance in some matter that likely would have been documented from builder to builder. In the end though, all we may have is a basis for some speculation!