A friend just got a Bill Large barrel, .375 caliber, with a solid patent breech and tang. It has W.M.Large, JJJJ and L stamped on the barrel. The bottom flat has 3855 and the name DARBY on it, and the word SLUG. Anyone know who Darby is? Roger also got a pair of slim .50 caliber rifled barrels , threaded but no plugs, drilled for a flashhole (I guess) and three sets of dovetails milled on the bottom flats. Would these be for a swivel barrel rifle? They are marked R. Paris & Son 141.