The C1 ACD (Anti Cant Device) is a leveling instrument designed for the C1 line of mounts to ensure that the weapon system is level before a shot is taken. It can be mounted on any C1 mount left/right fore/aft. It can be used in conjunction with and opposing other accessories or alone on the mount utilizing the provided standalone puck. The Level itself can be user calibrated to ensure that it is properly aligned to the user’s scope/weapon system. The level is made from a 3/4” glass vial and filled with a ceramic BB as opposed to an air bubble to ensure better accuracy and quicker response at different temperatures and pressures. 7075 T6 Aluminum, Mil Spec Type III Hardcoat Anodized.