Went with Ace ARFX-E but with the forward weight the balance was a little off as short as the stock is. Added a DPMS 1 inch extender and Daniel Defense Burnsed Loop Sling adaptor.
Give me a LOP of 13 inches (about the same as a Warsaw Pact length AK butt stock) and better balance. It is pretty solid so far.
I played with the standard AR height BUIS combo...a Troy rear and Samson front. They were good but just too high for me.
I went with HK 416 height fixed set (I think troy micros are about the same height) and I am very happy with the cheek weld.
Sight height differences:
Probably what's left is an FSC556 (deciding whether to stay at 16 inches or 14.5 barrel length), Vickers sling and a micro RDS (maybe Aimpoint Comp PRO but I am trying to watch weight)
Overall as it is now its 8 pounds and fairly well balanced.