So, I ended up drilling it after I wasn't finding anything else that seemed to be an option.

I still have a little bit of the outer part of the screw in the threads to get out, but I'll get to that in a few days when I have some time and patience. At that point I can see if whoever messed with it before me boogered up the threads or not (hoping not).

Thanks for all the input! I'm sure I'll ask more as I progress in this little project. I gave a little twist on the trigger screw and it's locked up, as well. Soaking it up now to try again later.

This poor thing has had a bit of a rough life it looks like.
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