I've got an AR10 and not really in the market for another, but I must say that's a nice looking, sweet shooting rig. It might look even more gooder with a Magpul PRS stock! GLWS - will be a great deal for somebody and shouldn't last long.
I really liked my 308AR it was flawless for everything I asked it to do for me. Have you tried m4carbine.net? Man tha tplace moves a lot of firearms. I put up a ton of stuff and it was all gone in a less than a week...bulk ammo, uppers and some optics. Good luck that's a sweet rifle