I really like my Burris Fullfield Tac30 scope. It's got an etched reticle that's visible without power, along with red illumination when I want it. I have it mounted on a Burris QD P.E.P.R. scope mount that seems to be pretty darn consistent when removing and re-installing. Plus, I've got a set of folding irons, with the front sight mounted way out on the end of a 15-inch MI keymod handguard that provides a 20-inch sight picture. Of course... although it's still a fairly lightweight set-up with a 16-inch barrel, it isn't exactly your run-of-the-mill "simple" carbine. So, I'm not sure it would really be what you're looking for. It does work well for me though.
BTW: I put a couple of hundred rounds of bulk Remington 223 fodder through it today, using both the Burris and the irons. 12 rounds through the Burris at 75 yards punched out just over an inch of paper, while the irons opened a 12-round group up to just about 2-inches. 'Bout what I would expect...