I ordered a Pacific Tool bolt head, called them about the firing pin hole. They told me that unless it says bench rest in the description, it is a standard (large) hole. I also read a thread that said PTG heads are all small. I guess I will find out. They said they actually turned down the firing pin to cure the problem. A drill and fine garnet paper. I will grind out the "bump". Can the firing pin hole be drilled out to size? I really appreciate all the info. And, NOR CAL, you are only as old as you feel. At least, I keep telling myself that....