Machined Aluminum mount allows you to mount the Sniper Tool Designs Angle Co-Sine Indicator (ACI) directly to your MIL STD 1913 mount. Attaches with 2 soft point set screws so it will not mar your mount. Also Fits M16/AR-15 flat top rifles. Mil Spec Anodized Hard Coat Type III, Black. Mounts the ACI below rail. Mfg: Badger Ordnance