I run a couple of 5.56 guns with Aimpoint CompML2 optics. I like them for the most part. I don't like the weight they add to the gun; 13 oz with a Larue mount. I'd love to check out the Aimpoint T1/H1 optic, but funds are too tight right now. The T1/H1s are like 4 oz vs 13.