Micro: Here's the scope I recommend for ya ar15. It is similar to the one ya used in the military. It has mildot crosshairs and they are lit (either red or green) if ya turn them on. I bought one just to see what it was like and am pleased with it. I think you would like it as well.
You will like it.
http://www.atomicbobs.com/editpost.php?id=1174357
http://www.ebay.com/sch/i.html?_from=R40&_trksid=p2380057.m570.l1313&_nkw=bug+buster+scope&_sacat=0

Liberals are like a "Slinky". Totally useless, but somehow ya can't help but smile when you see one tumble down a flight of stairs!