Taction 45 Degree Offset Iron Sights allow you to slightly rotate your weapon to witness the target through them and engage. Our 45-degree flip-up BUIS (Backup Iron Sight) is made from aircraft-grade aluminum and mounts easily and securely to any standard 20mm picatinny rail system. With a simple press of the button your offset iron sight will pop up quickly and reliably. The Tacticon 45-degree flip-up offset BUIS features fully adjustable windage and elevation, includes a sight adjustment tool and weighs in at only 1.7oz.