My gun was 1989 and I had the bump inside the bolt, so you couldn't put the head in backwards. They phased them out around then and no new bolt head will go in. Somewhere else on the internet someone said you could file it out. Well, I filed and filed and finally I drove - to a machine shop. The firing pin diameter was reduced a little later - don't know why - and new bolt heads require the smaller pin. I bought the whole FP assy, to make sure I hadn't missed something else. You also have to get a new firing pin retaining pin, the small black pin going in sideways. If you are to the point that you need a new bolt head you might also need the cocking sleeve and button - possibly not the correct names - small parts inside the bolt at the back. Check them visually for wear. Once all that is out of the way the old bolt should be fine.
Just reread your post and realized it was the other guy asking. You might want to just exchange bolts. They clipped me for $40 to grind out the lump inside the bolt - probably my fault for driving up in my Acura. It was still a little cheaper than a new bolt, but not by much.
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