I agree with John, CZ and Fudd. It implies to me a test device, standard for comparison etc. Until I've seen more pictures of Mike's gun I'm not even going to speculate. I would like to know how much of the bbl is smooth bored, where the join comes and how the transition from smooth to rifled is accomplished, also bore and groove dias of the rifled section would tell us a lot. Any input or ideas????

Hugh Lomas,
H.G.Lomas Gunmakers Inc.
920 876 3745