Ok ya'll I am building my CQB upper and the big question is will a Red Dot Co-witness with my iron sights. My Dad has a Red Dot he will give me and of course in my box of parts, plus the sights I am selling I have a fold down front sight and the Matech rear. I thought if the red dot would co-witness with the Irons I would put it on, if not I will consider the 45 degree offset mounts but I would prefer to keep everything on top. Thanks for all your help. 
