New to this forum but some members may have seen my name at other forums. I am into black powder besides my other guns and have built a lefty side lock 54 cal round baller with a green mountain barrel and am in the process of building a 12 guage and a 54 cal fast twist. (green mountain barrel) Both these guns will be underhammers and not sure how I will build the actions yet if I will go with conventional plans or make up a design of my own. I will ask of any ideas at the gunsmithing forum. Both of these guns will have full stocks on them so they will be a bit different from the Hopkins and Allen underhammer designs. Jim