Before I pull the trigger on a 1-4x AR scope is it possible to get a decent co-witness with BUIS with the scope set on 1x? My two concerns are the length of the scope tube could give you a tunnel effect and what heigth of a ring gives a good cowitness with 1-4 type scope? If using BUIS with the scope mounted is not an option I would consider mounting the scope with a quick release mount.