Love the holosight. I actually don't have it co-witnessed, per se, I have the fold down BUIS and keep them down out of the way. I sometimes will shoot it with the iron sights up, holosight off, and when I shoot with the holosight, I fold down the BUIS.
On the heavy barrel Bushie, I just put a Rock River Arms 2 stage National Match trigger, and boy, what a difference that made! It is too sweet.
If Obama gets elected it will be the justification for a few hundred million to be spent on guns My wife is already letting me take money out of the budget to buy guns incase he gets elected but hoping he wont.
These are my 5 AR's, all Bushmasters. All run like a top with any ammo, and are very accurate. I'll probably scope out the Modular Carbine, (second from left), after the first of the year. I think I'll keep the others stock. Bill T.