A little late, bu I got my first AR last week.
ATI Omni lower, DPMS upper.
Took her for a quick range test over the weekend, thanks to the rain, I only put about 50 rounds down range out of my planned 150-200, but even with just that small sampling, it was accurate enough with a simple red dot shooting offhand standing.
My buddies said it was LOUD without a compensator (bull barrel), so I might get it turned down and threaded for one. Still, I was pleased with my purchase.