On my 20" AR I have an ACOG. On my carbine (lightweight, short range blaster, SHTF) I have a tritium front sight post. Works great, no real possibility of failure like on optics. I don't plan on making any shots past 100, and at 100 - it's a piece of cake to make rapid fire hits over and over on a torso sized target.
Did the reddot thing. I'd rather trust my life to the good old irons. They work for the real-world threats I might encounter. No nonsense, no worries.