Troy BattleSight M4 Fixed Front TritiumJust because the light"s not perfect doesn"t mean your aim shouldn"t be. Troy Industries" TRITIUM BattleSights are designed for twilight or any low-light situation. TRITIUM is a form of hydrogen that emits a continuous light source where using batteries or electricity is not possible. The front post is centered between two Tritium points of reference to allow proper alignment, eliminating the poor sight orientation that is typical in twilight.Troy M4 Tritium Sights:- Front Fixed Tritium M4 Style BattleSights made by Troy Industries- Looking for rock solid stability and dead-on accuracy in a fixed sight? Troy Industries Fixed BattleSights get the job done. This permanent, rail-mounted alternative to a standard A2 sight allows limitless mounting options on all-length rails with a serrated ramp to eliminate glare.- Provides a continuous zero, unflinching durability and peace of mind.Troy Fixed M4 BattleSights:Looking for rock solid stability and dead-on accuracy in a fixed sight? Troy Industries Fixed M4 BattleSights get the job done.- 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- Hardened T6 Aircraft Aluminum with stainless steel components- Technical Specifications- 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- Hardened T6 Aircraft Aluminum with stainless steel components- Front sight must be mounted at the same height plane as the rear sight. Railed gas blocks that are lower than receiver height will not zero properly.