I have an MGI QCB flat top upper with a 14" 5.56 NATO 1/7 twist barrel on it right now.

I am also getting some sort of heavier, longer range, long barrel for it (have not decided which one yet).

I will probably fire M193 in the short bbl and something heavier in the longer bbl.

Between the Trijicon TA31RCO 16”, the 20”, and the TA31F, which of those three do you all think would be the best all around optic?

If I were pressed at this point to pick where I would want to have the optic “right on,” and where I would use a little Kentucky windage, I guess I would want the optic functioning properly at the longer ranges with the longer barrel, and then I would compensate accordingly with the shorter ranges and bbl.

I’m no expert and I am open to getting an education, comments, etc.

P.S.  Comments on a flip up rear BUIS would also be appreciated.

Thanks in advance for any help you might provide.