The Meprolight® FUBS Flip Up Back Up Sights – Green is designed for quick target acquisition in virtually any lighting condition. Premium grade green Swiss-made Tritium vials, two on the rear sight and one on the front sight are always on for quick target acquisition in low light or nighttime conditions and are bright enough to see without impacting your sight picture. Plus, the front sight features a bright fluorescent contrast green colored ring for quick daytime target acquisition, perfect for those all-day range sessions. The Meprolight FUBS can be mounted directly to any Picatinny rail with no modifications using the 2.5mm Hex key (included) and you can easily adjust for elevation and windage without tools. Constructed from high-grade polymer with metal parts for lasting durability and superior reliability, this backup sight can be quickly flipped into place with the instant spring-locked deployment mechanism that is designed to not slip, break, or deform. Meprolight FRBS sights can be used as a primary sight or for backup sights if your primary optic goes down and feature a 12-year warranty for night sight illumination. Compatible with most tactical-style rifles. Don’t wait and order today!