The FRN versions are not flat ground, and in my experience don't cut nearly as well as the flat ground G-10 model. I even had Tom Krein turn one of my saber ground ZDP Enduras into a full flat grind, and I'm seriously considering shipping the rest of them to him for the same treatment.
Maybe it was a regrind or one that was frankenstiened together, but I'm positive I saw a FFG FRN version. I'll see if I can find the pic.
Thanks for the info though.