Receiver arrived today. I was bit surprised to see this is not a pristine new item; it has mounting marks from the trigger guard, drag marks from the safety, and a few small dings from metal-on-metal contact at the rear from an upper housing slamming shut. Still, I re-read the original GunBroker posting, and at no point did the offeror state he had new receivers, only that they are made by Tortort Mfg. So I really don't have a point to bitch. To be fair, it is still a very nice looking piece of work. I believe though, I will go with the cosmetic treatment in Czech blue (or maybe Czech grey?) cerakote.
Oh, I did do a fit check for the barrels, both are a definite interference fit. I think I'll send both so the builder can pick which he thinks will work best. The barrels both passed the fit-up and plunk test, but I don't have a scope to inspect for chatter or other possible machining defects in the bore.