PRS The Ghost Cheek Riser makes it easy to adjust the height of the cheekpiece. Adjusting the height of the cheek piece is the best way to improve eye placement with binoculars and achieve the correct head position. It is especially useful when binoculars are mounted on BRK Ghost with high mounts. A good eye/binocular alignment helps eliminate aiming errors like parallax - and helps improve accuracy. It has the added bonus of allowing you to achieve a correct weapon alignment when bringing the BRK Ghost into sight.