The Troy Industries Front 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: 1/2 MOA elevation adjustments 0.460" profile when folded 6061-T6 aircraft aluminum with stainless steel components Quick install Easy to adjustThis sight features the familiar Y-shaped protective ears found on the M4/M16 family of rifles, and matches perfectly with Troy's Di-Optic Aperture rear sights. The snag-free design also features a glare killing serrated ramp. This front sight is designed to be mounted on rails that match the height of the upper receiver and will not zero properly when used with shorter or taller railed gas blocks.