Neither does my Bess have a patent breech. Good working lock, I did increase the mainspring a bit. I also made the pan "deeper", which in effect raised the touch hole. Then I coned the touch hole. It's very reliable, as it should be, with that big musket lock, big flints, big frizzen, etc. !!! By the way, I don't think barrel length, within reason, has any effect on patterns/range. ??? But I'm not positive about that.