This is not going to be a review because I just haven't had time to do anything with it. I have too many things going on.
The AR-556 is the low-end Ruger -- runs around $700. My nephew bought an AR-556 a few months ago. He has put a scope on his. I've shot it. His trigger is horrible. The trigger on mine is merely heavy. I could probably learn to live with it. Whether I will or not is another question.
I need to go buy some bulk ammo and get used to the sights.
The Ruger is a standard, modular design, so anything I can't stand can be replaced.
I never thought I would get one of these. At this point, I am not particularly happy or unhappy with it, except for the fact that the ruling class doesn't want me to have it at all. In that regard, I do feel good.
I am not going to hunt deer, turkey, or coyotes with it -- though I could. I don't really have a purpose for it or even a niche, but it fits in the safe, and I have it.
They are fun to shoot. So there is that.