Tactical Flip Up Sights by GP - 100% Guaranteed Constructed of 6061 aircraft grade aluminum, very solid and very durable piece of hardware and light in weight. Calibrated and matched together as a set, very well made sights and securely mount to picatinny rails. Rear sight: wind age adjustable features same moa adjustment as standard sight andfront sight: A2 post elevation adjustment. Great addition and installed without any problem. Shipped promptly and packaged well to protect the product.