Bushmaster XM15 E2S, which is a 1:9 20" HBar, the only modification I made so far was a smaller aperature and post, which improved my ability to be more accurate. A new trigger may come next year. This gun is shoots very well, an inch or better from a 100 yard bench w/hornady 52 gr Amax. I wish I could hold that well off hand, but I don't do too badly, <G>, Spanish stuff is usually under 2 inches.
Keep shooting,
Longtrain