Exactly where is the hinge pin on a Charlin ?
I'd like to know that one, too.
I know you are the champion of the Darne, Ted, but when you make a disparaging comment about the only other significant design for double guns you must expect a challenge. I think that was probably the plan anyway.

Your statement implies that hinge pin guns are somehow a lesser quality design than sliding breech. Well ...... if you build a better mousetrap, ......... you know the rest. Darne tried, but for some reason (apparent to me) the world didn't beat a path there. Did something contrary to the laws of economics occur in the world of commerce that denied Darne what was rightfully their place at the top of the market, replacing hinge pin guns as the major design of doubles?
All my best, SRH