Keeping your rifle in the same position after every shot is essential for accuracy, the Anti Cant Device aids the shooter in keeping the rifle from canting during repetitive shots. These ACD's are manufactured from 6061-T6 then Type III hard anodized for durability. Screw on cover protects the glass vial from damage during transportation, and during shooting the cap saver on the opposite side allows for storage of the cap. Unlike the standard rail mounted ACD, this model allows the user to fold the level in a storage position and is retained by a ball detent in each position. Mounts to all 1913 Picatinny rails in seconds.