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mimms2 did the slot but definitely didn't do the extractor.

Did it maybe 94? Interweb wasn't as prevalent so relying on reading material. Cant remember where I read it but I decided to try to get the ammo to start in the rifling as the chamber wasn't exactly...

I did that by facing off the barrel. then loctite'd the barrel into the reciever

Most of the honeing, chamfering and rounding you could do yourself. Possibly the same on the extractor but you have a better one so forget I even mentioned it
I am not over fussed on the little pin...