I would like to hear from people that primarily run ACOGs (or some other magnified optic) on their carbines. Do you use the BAC? How easy is it to learn? Why do you prefer an ACOG to something like an aimpoint with a 3x magnifier?
Any RedDot is going to be easier as there is no fixed position to align with to be on target. They work much easier for awkward shooting positions and shooting "weak side".