Nice rifle; I use a lot of KAC stuff myself. What'd you do with the KAC flash hider? Wanna trade something for it? I have a QDC can and could use it if you don't.
I can tell you why I'm not fond of the dual reticle: they're cut for one barrel length and two specific bullet weights and that's it. You can work around it, but it works better at closer ranges; it works best with 16"bbl.'s and 115 supers and 220 subs. For longer ranges, differing barrel lengths and bullet weights, a plain mildot works better IMO/E.
I have an ACOG with a similar reticle and barrels from 8.2" to 16" but I honestly can't say I've tested the ACOG on the different rifles. I bought it for the 11.5, read the book and put it on the 16". I doubt the reticle would be unruly to live with, but I'd rather use it on what it works best on. I used to have a mildot on the 16" and it worked best, especially at longer ranges. The 2.5-8x MRT was about as perfect as it gets for a BLK scope with a longer barrel IMO, wish I still had it setup like that and would if I didn't have the ACOG and didn't need a scope on a nicer 5.56 rifle.