9mm revolvers, and break open revolvers, I know they did exist at one point in time. The break opens if any are still made are all models of something fairly old. My question is, how much would either one cost? What were the problems with break-open style revolvers, and 9mm revolvers? There aren't any in shops, I am assuming there is a problem with them or their usage is not comparable to today's standards of other rounds. This would be for collection only, I don't ever plan to shoot something like this, if there are so many problems.