Thanks to this thread, I sent in some parts for JRA to mount to a Gen2 Receiver. (they will take your bolt, barrel and mount it to a Gen 2 receiver)
It took a little over a week for them to come back to my FFL with a new receiver. It looks a lot better finished than the Gen-1 - very nicely done.
Some minor fitting getting it together, my Mag/Release catch needed a little filing to hit the mag follower - it was binding against the metal feed lips just in front of the pad. The front mag catch block needed some file work fo fit perfect. It would fit, but was stubborn, so I did some file work and its perfect now.
I did some lapping and polishing of the carrier to the action - it is butter smooth.
I finally took it to the range yesterday and ran a bunch of ZQI 7.62 through it. Zero problems, functioned 100%.
I went to look for BM59 mags and I wish I had picked more up a few years ago - they went up! (like everything!!!) Glad I got 8 back when they were like $30 each, should have gotten more (as always).