This is something I did on a N.W. trade gun years ago. I took a bolt the same size as the bolt that comes up from in front of the trigger guard and thread into the tang and filed it flat in the shape of a rear sight with a small notch in it. It replaced the trigger guard bolt. It worked fine but now these old eyes aren't as good and I found out I can shoot it just as well without it just looking down the barrel. Maybe it is something someone would like to try.