Crimson Trace Corporation, RAD Max Co-Witness Mount, Black WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov. 6061 Anodized Aluminum Fits CT RAD MAX and CT RAD MAX PRO Full co-witness pic rail mount made from aerospace grade aluminum and tailored to fit the CT RAD MAX and CT RAD MAX Pro, it is also compatible with the CTS-1400. Combine your favorite CT Red Dot to get a full co-witness sight picture using this mount. The Mount fits most MILSPEC M1913 style Picatinny Rails.