Mission First Tactical's Flip-Up Front Back-Up Sight is constructed of military-grade polymer. It has standard iron sight elevation adjustment, with each click equaling 1/4 MOA (standard front sight tool is required). The front sight mounts onto a 1913 Picatinny rail. A slim profile allows the sight to sit under most optics. It will accept any standard front post blade. Unlike other backup sights, MFT developed a shroud to shelter the front post blade from debris and impact damage when not deployed. It is 2.23" long, 1.08" wide and is .879" high.