The only time I've really shot it for accuracy was a typically windy day with a nasty crosswind (30-40 MPH gusts) in Reno. I tried to shoot during the lulls, but there was always some wind. 5-shot groups averaged just under 3" at 200 yards, with one a hair over 2", and two that almost hit 4". This is with the setup you see above (4X ACOG) and a special target I made for triangle ACOGs. This was using 69gr Sierras, handloaded fairly warm. Certainly not great by benchrest standards at around 1.5 MOA, but given the role of the rifle, it's plenty good enough for me. Under conditions closer to ideal, it would be better, but then, I don't count on having ideal conditions if I were to ever need to use the rifle defensively anyway.
I was also able to ring the 400 yard gong pretty reliably, at around 8.5/10, but there was too much wind to hit the 500 yard gong more than once or twice out of 10 tries.
I could have elected to go with a match barrel for a bit more accuracy, but I prefer the light weight, reliability, and durability of a chrome-lined barrel, and given that I can reliably hit a 12"x12" gong at 400 yards in less-than-perfect conditions, I have all the accuracy I need. 5.56mm ammo simply doesn't perform well enough at ranges beyond that for me to worry about having more accuracy.
-Troy