Well in none of the guns pictured is the distance between the pivot point and the lockup 3 times greater than that of an ordinary break open single (Or Double). Have no idea where that theory came from but think we can pretty well scrap it. Several old American "Farmers" singles had removable hinge pins which fit through a complete round hole in the bbl lug rather than in a Hook. I have my Dad's old 16ga Hopkins & Allen which was like this. On most of these the pin threaded into the opposite side of the frame & was equipped with a folding handle which fit in a recess on the handle side for removing. Don't know they were any more noted for staying tight than the hook system.
I highly suspect that far more break open guns have become loose from being opened & closed countless times in a gritty, grimmy unlubricated condition than have ever been "Shot Loose".
I have several 100+ year old guns which are still tight & do not appear to have spent all their life as a closet Queen.
