The C1 ACI allows for the attachment of the Sniper Tools Design ACI directly to the C1 line of mounts. It can be used on any C1 mount left/right fore/aft though end users will need to purchase right or left handed ACIs accordingly as the ACI design itself is not ambidextrous in nature. It can be used in conjunction with and opposing other accessories or alone on the mount utilizing the provided standalone puck. The C1 ACI mount can be configured for 2 different ride heights on the mount, high or low. The Left Hand ACI is built for left handed shooters and mounts the ACI on the right side of the mount to be visible when shooting. 7075 T6 Aluminum, Mil Spec Type III Hardcoat Anodized. Weight .7 oz.