Armament Technology Inc (ATI) specializes in professional-grade weapon sighting systems, including optical combat weapon sights, long-range precision rifle sights and OEM mounting solutions. Tangent Theta and Tenebraex are divisions of ATI, we are the OEM manufacturer anti-reflection devices, tactical tough flip covers, Optical Filters, Polarizers Under our Tenebraex brand as well as multiple models of long range riflescopes under our Tangent Theta brand. ATI is also the master distributor for ELCAN optical technologies, SAI Optics and Xoptek micro reflex sights. (less)