The Aimpoint CEU (Concealed Engagement Unit) gives the operator the ability to observe and/or engage a threat from a concealed or covered position. The Aimpoint CEU easily rotates from side to side, so an operator can safely look around either right or left-hand corners, over barricades, and under vehicles. It can also be quickly removed in order to rapidly return to direct engagement. The Aimpoint CEU rotates a full 260 allowing the operator to safely look around either right or left-hand corners, up staircases, or down tunnels from almost any angle. To mount the CEU, use the Aimpoint Twist Mount base and choose the CEU ring which allows co-witnessing with the Aimpoint sight.