The Troy Industries Rear Folding BattleSight is the gold standard for back up iron sights. The folding sight locks securely into the vertical position with a solid stainless steel crossbar, yet folds easily with the push of a button. Its rugged reliability has led this sight to become a favorite for Special Ops and tactical shooters around the world.Features: Each click adjusts 1/2 MOA 0.460" profile when folded 6061-T6 aircraft aluminum with stainless steel components Quick install Easy to adjust Protected adjustment wheelThese standard sights feature a traditional dual aperture set-up that is perfect for shooters used to the standard M4 sight picture or those who want to take advantage of the battle proven speed of a round aperture.