I run Burris Tactical extra-high rings for my Millett DMS. My GG&G BUIS sits behind the rear ring and underneath the scope bell. The front ring sits in the first slot on my forend. It's still at the standard 2.6" height, so my head position does not change whether I'm shooting with irons or optics. I'll probably go to a one-piece mount for the durability and to get the entire mount on my upper, but what I have now works good.