Some Berettas had a slim profile in comparison to the Browning guns with there hinge & bolts both below the barrels. These Berettas used trunions on the side of lower barrel to hinge on & bolted via two tapered pins protruding from the breech into holes in a pair of blocks set between the barrels on either side.
Added;
The bolt blocks on each side had an angled front face which turned into recesses milled into the frame walls to assist the hinge pin in handling back thrust. Although I am not particularly an over/under fan this would seem to be a quite excellent design if properly built & fitted.
Last edited by 2-piper; 11/14/13 08:39 AM. Reason: added info
