The KAC micro are miles away from the Magpul, they are much smaller and all steel to begin with. And you can dial the rear sight from 0 to 600m in a twist of the "barrel". If you plan on using the iron the KAC are the best there is, if you won't use them unless your optic goes down tho the MBUS are fine. I like having the option to take the guessing out if I want to shoot up to 600m. With the Aimpoint in a cowitness is I just turn it off, flip up and dial the iron and be very close to where I am aiming.