Thinking of getting an aimpoint Comp M4. My question is, does the mounting system that comes with it put it at the right level for absolute co-witness on a flat top ar-15? I understand that the aimpoints will never run out of battery life, but just in case they do, I would like to use the flip up front and rear magpul sights and be able to use them looking through the lifeless red dot. Also, what does everyone think of this sight compared to the other Aimpoint red dots? I am stuck on Aimpoint. Thanks very much for any and all input.