[PapaBear3625]

1) AR-15 with holographic sight

Be sure to ALSO put in a supply of batteries for the sight, and a replacement no-battery scope sight for when the batteries run out.

[IamConservative]

Be sure to ALSO put in a supply of batteries for the sight

Excellent suggestion. I also need to get spare batteries for my tactical light on my M+P 9mm.

[Travis McGee]

I'm very partial to this scope for a lot of reasons. It has an actual etched black reticle, so even with a dead battery it's still a "real" scope. (It takes a little coin-sized CR-2032 battery, and they are so small you can store extras in the rifle grip.)

If I could afford thousand-dollar 4X Trijicon, that would be better, (no batteries), but it's just out of my price range. For less money, I put a Burris on each of my ARs.

At my age with my eyes, a 3X or 4X is ideal. With iron sights I can't make out indistinct targets in brush in low light. With the Burris, the target pops out very clearly.

Up close (zero to about 25 yards) I don't feel I give anything away with a 3X. I've taken high-speed carbine classes and did great in the fast and close drills. But from 50 yards back, the 3X is pure benefit.