Troy Rear Folding Tritium Sights, a permanent, rail-mounted alternative to a standard A2 sight, allow limitless mounting options on all-length rails with a serrated ramp to eliminate glare. Troy's Tritium BattleSights are designed to eliminate the poor sight orientation that is typical in twilight. Tritium is a form of hydrogen that emits a continuous light source when batteries or electricity are not available. The front post is centered between two Tritium points of reference to allow proper alignment. Just because the light's not perfect doesn't mean your aim shouldn't be. FeaturesTritiumQuick installA stainless-steel cross-locking system ensures sights remain upright and zeroed under extreme conditions.Sight can be moved or taken off without permanent modification to the firearmFeatures snag-free apertures at factory heightA push of a button folds the sights securely out of the way until you need them againZero-canting attachment systemEach click adjusts .50 MOA