Sinsaba, I finally noticed the link you had with your post (DUH!). I see what the issue is with your sight and your BUIS. The sight is mounted on the FF sleeve rail. The BUIS is mounted to receiver rail, creating a significant height difference between the two. To remedy this, you could get a new FF sleeve that doesn't have the longer top rail and mount both sight and BUIS to the receiver rail. Or move the BUIS up on to the FF rail, but that might cause some significant sight picture isses with the BUIS.
ProficientRifleman, both the ACOG and the Reflex are made by Trijicon.
GoRon, some new models from Aimpoint are magnified. Most are non-magnified optical sights. Aimpoint also sells a magnifier that can be mounted behind the 1x optical sight.
Mike