Gil and Jay Cee, $25,000 and even more expensive Berettas have monobloc barrels (not my preference, but a fact of life) and there are many Kersten bolted guns that have no under-locking lugs as well as many that do have them. Now that someone has found the maker on a list of Italian makers, the gun becomes less of a mystery gun. The bass ackwards trunnion system is just one maker's attempt to be different. Unless the receptacle for the hinge assembly is replaceable, fixing one of these things once it gets a little loose would be a machinist's nightmare. The Beretta, Remington, Krieghoff trunnion system is so much more gunsmith friendly.