If my memory serves me correctly... Ohio Rapid Fire did sell the mk19 kits for somewhere between 3-5k.
I did a quick search and the website appears to be down. Seems the owner passed away so I am not sure what became of the store. They were also making/made 80% receivers.
ETA: Here is a link to an old add:
http://www.akfiles.com/forums/showthread.php?t=23060


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