Like it's been said before, it all depends on what you're protecting yourself from. For terrorist-types I prefer the M4A1, complete with ACOG, PAQ-2, and surefire. :P But really, if your area has a lot of drug problems, I'd recommend a heavier caliber. It's amazing what adrenalin alone can do to the body, much less mind-influencing drugs.

As far as sights go, with an AR-type in close quarters you really don't need a reflex site. The front sight post works pretty good. During training exercises I've managed to hit pop-up targets and the like dead-center in the face with just the front post. But, I have seen some EOTechs that are pretty nice. I kinda wanna get one for my M4, as well as something like http://www.bravocompanyusa.com/BCM-G...%20mod%203.htm . Just not one that will break, y'know.