IMHO, optics are the assumed baseline now, unless you just like the nostalgia of irons. Not to say don't get a BUIS if you like or if your carbine use is such that an optic failure could get you killed, but a red dot Aimpoint or EoTech or ACOG or Accupoint is going to be faster, more accurate, and more useful for more hours per day than old school irons.
Not to mention that you can get an Aimpoint and a 4-12x scope, both in QD mounts, and set up the rifle how you need for that day or even that stand, and have the absolute best of two extremes with the simple flip of two levers.
Here's a good read.
viewtopic.php?f=18&t=44



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