I have a spare gen 3 that I'm gonna strip and use everything but the slide/barrel/frame.
If it works out well then I'll buy OEM parts for the 80% and put the factory stuff back in the spare gen 3.
Gotcha... way back when, you could get everything but the frame for most pistols on Ebay. I guess they were pistols that were "destroyed" and they only chopped up the frame. I got all the parts for a Ruger P90 for like $100 (minus the frame, obviously). I didn't know if something similar still existed or not.