My AR budget is more modest than most, it seems.
Burris Fullfield 2-7x32 Ballistic Plex in high Weaver 4x4 rings atop a Weaver riser block.
I also have a Vortex Strike fire sight for it, but haven't had it mounted in a couple years or so. The low end of the Burris seems to work well enough up close that the Vortex is unnecessary.
