Do not buy / poor design - AT3 Tactical AR-15 Flip-Up Spring-Assisted Backup Mounted Iron Sights w/ Front/Rear Set

I repeat do not buy this item! The holes where the screws are in which the spring actuated flip up sits is CUT WRONG your front or rear sight will sit at and ANGLE providing INACCURATE sight picture. Irons are supposed to sit 90°, my front sight post came at an angle. Metal is cheap and easily bent and broken. USER ERROR RULED OUT