Polymer Flip Up Front Sight with standard iron sight elevation adjustment mounts onto a 1913 Picatinny Rail. Will accept any standard front post blade. Standard front sight tool is required with each click equaling the standard 1/4 (0.25) MOA adjustment. Unlike other backup sights MFT has developed a shroud that shelters the front post blade from debris and impact damage when not deployed. A slim profile allows the sight to sit under most optics.