A very interesting little weapon there. Derringers are fascinating. I used to own a lot of them but over the years just kind of sold them off here and there. My one thought on a derringer is, if you have to carry one, because of the limited shots... make sure it is a larger caliber. Because you might only get the one shot and you better make it count. I still have a .45 long colt single shot derringer. I purchased that because it can also shoot a .410 shotgun shell.