Looks like a good idea. Keeps the pin from rotating too doesn\'t it. I have been thinking of using a straight pin with a head that is drilled for the pin on the face out at the edge instead of the counterbore for a piercing punch. The head would be a slip fit for the deep hole in the bolt The goal is to have a firing pin that can\'t rotate so the striking end can be chisel pointed, and stay oriented. I\'ll let everyone know when I get that far.