I was excited when I heard RRA was coming out with an AR10, but it was a let down to know that they had designed the BAR10 for Bushmaster, and they were now going to produce them.
I'd hoped to see something using G3 mags, since they are plentiful.
I had an AR10T, and it was as accurate as my current Hart built Rem. 700, and more so than any other rifle I've shot. I'd buy another if Armalite would come out with the redesigned mag.
The modded M14 mags are o.k., but just not good enough. some guys have had no problems, but too many have for me to have confidence in the system. sporadic problems, on top of paying $40-50 per mag isn't good enough.
Given currently available rifles, I'd go with a DPMS with the new A3 type upper. The original AR10/SR25/DPMS mag is good to go, and I haven't heard anyone complain of problems using that combination