Yeah, I've been playing around with it to see which set up I like best on the AR. This is how I have it set up at present.
I swapped out the OEM HGs for the quadrail the the ACOG for the 552, the A2 grip for the MOE grip, and the A2 stock for the aftermarket A1 LOP stock.
I like the fact that I can co-witness the irons and the 552 with this setup.