TacFire Tactical 45 Degree Offset Flip Up Front & Rear Iron Sights, Spring Loaded TacFire official product, tactical 45 degree Offset flip up iron sights front & rear mount spring loaded Flip-up Posi-lock design to guarantee zero Front sight A2 post with elevation adjustment Rear sight with dual Aperture with windage adjustment designed for close QUARTER Battle Made of durable and lightweight T6 6061 aircraft grade aluminum