I'm not sure if you've seen it, but in Best of Shooting Times this month there was an article of a comparison of AR's. The article is on page 28-32 if you can find the issue. In it, they compare AR's from Rock River, Armalite, Bushmaster, Colt, and Stag Arms. It's a fairly complete review more in terms of long distance accuracy. They cover several different topics like bullet weights and barrel twist, and the AR's potential and different uses someone might like. If you'd like, I can post some of what they found, but the most accurate was teh Rock River Varmint with the 24" barrel and a 1:8 twist.
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