Okay, you got me. I ordered a KS-47 lower. I'm going to strip the Faxon 16" gunner barrel of a upper and put it on a PSA upper. The PSA stripped upper is out of stock, but the bolt carrier and lower was in stock. I figured buying the lower puts me in the game and I'm immune from price increases or bans. Got a picture of the inside of your upper receiver? I wonder how hard it is to machine out a upper to fit?
I have always liked the 7.62x39mm AR and absolutely loved the Knight's prototype they build 20 years ago. CMMG mutants have always been just a tad higher than I wanted to pay. When the Colts were around, the weird mags always turned me off. The $199 PSA lower ($275 after shipping, taxes, FFL transfer), is a good starting point. I actually bid on several CCMG Mutants on gunbroker and always missed out by just enough to not make me sad. I finally built a couple of 7.62x39mm AR uppers and got some Duramags for it. But your picture/post got me to stop waiting and get a lower.