First, we start with CMMGs 10.3" M2 build up:

So here we go:
A. Remove the Carry Handle, replace with MagPul BUIS that holds a rear tritium aperture.
B. Put EOTech on with the correct mount for total cowitness.
C. Replace front sight with tritium post on a MagPul BUIS front sight.
D. Replace A2 flash hider with a Vortex Striker
E. Add Redi-Mag
F. Replace handguards with a decent four rail system
G. Add a short VFG, Vltor Off Set Flashlight mount, Surefire tactical light
H. LET HER ROCK!!!
I'm sure more additions will come to this dream gun but that's what I have so far. I think I'm going to need a few promotions! :P