Hey BSA...next time you're tempted to sell that AR, give a little thought to the idea of just rebarreling it. I'll betcha that would bring it into the sub-MOA realm.
Myself, I only have BUIS on our two house guns (my hunting ARs have no BUIS on them). Primary sights on these are Leupold Prismatics with illumination, which I selected because of the etched reticle in order to be free of dependence upon batteries. They work well and I do not expect a failure, but they are attached via QD mounts and can be easily removed. I did not spend a lot of money on the BUIS, just went with Guntech when I saw a sale on them. I think if my vision (and my wife's) was better I might have opted for something a little better, but there's the vision issue as well as the extremely low likelihood of ever being used. One thing I like about them is I can easily fit them with Trijicons, which I may or may not do.
My use for these guns is totally different so my perspective is completely different too, but I think it offers an opportunity to expand the discussion a little.
Thanks for the comments RiverRider. As for the barrel, I will leave it on there for a while. Set up in this fashion, it works very well for my needs. I'll see if I get my azz handed to me in the shoot next saturday though. If that happens, I may re-think that. We may have some heavy hitters come from Portland and Vancouver. Hell, If I could get a 6mm ARC barrel exactly like this Noveske barrel, I may consider changing it out. I'd keep it set up exactly the way this one is though: using these Ultradyne BUIS and my Burris AR556 4.5-14x42 combo.. Like I told rost, if I can maintain 1.1-1.2 moa and score 100-8x average, I'd be happy as hell. As it is, this rifle has been shooting just about that good. The other day, I was testing some loads and got a little better accuracy with R-P brass vs. FC brass, so I may just switch over to R-P in this rifle. I have 1500 pcs primed and ready to load, so I'm good to go there. I also burned up about 300 rounds of 223 that day with 2 other rifles, trying to find a good load for that 75gr Hornady BTHP match bullet.