Originally Posted By caduckgunner:
Can you still fit a BUIS under your ACOG if using this mount?
The RCO fits (is made to fit) at the closest point to the shooter. In other words you won't have any flattop left to put the BUIS under the eye piece. What some shooters do, is put your BUIS in front of the scope.
Good luck! Somebody will post a pic in a minute :)