I shot at a club years ago without my guns. Their rental was a beretta o/u that was tight when closed but so loose and wobbly when open I thought it would fall apart. Whether through mishandling, I assume guys let it fall open hard and slam closed, or just use the trunnions had become worn and not replaced. I don't think, at least in the Beretta design, one thing affects the other, in other words it can be loose when open and still lock up tight when closed.

This ain't a dress rehearsal , Don't Let the Old Man IN