Knight's Armament picatinny rail mounted 45 degree offset micro rear flip up sight. Flip-up sight stays down out of the way when using optics, yet is easily flipped up. A robust detent holds it in the up or down position. Mounts at a 45 degree angle to allow operator to cant the rifle slightly to access the iron sights while keeping any optics mounted to the rifle. Sight is similar to Knight's Armament's 200-600m micro sight. BUIS mounts to any AR-15/SR25 flat top receiver or railed handguard. Sight is elevation adjustable by turning the body of the flip up portion. Windage is adjustable by turning the micro knob on the side of the sight.