Troy HK Tritium Folding Sights TRITIUM is a form of hydrogen that emits a continuous light source where using batteries or electricity is not possible. Target acquisition is made possible in low or no light conditions. – No limited sight orientation due to low light conditions – Front post is centered between two tritium points of reference to allow for proper alignment – Flat Dark Earth Note: Sight is designed to work on same plane rail systems only. Will not work with a railed gas block that is higher or lower than the receiver. Troy Industries Sight Adjustment Tool included.