TROY Industries Tritium BattleSight is designed for improved sight orientation in low-light conditions. Tritium emits a continuous light source without the need for batteries or electricity. This rear folding sight offers a permanent, rail-mounted alternative to standard A2 sights, featuring limitless mounting options on all-length rails and a serrated ramp to reduce glare.The sight can be easily moved or removed without permanent modification to the firearm, featuring snag-free apertures at factory height. It is compatible with same-plane rail systems only and will not function with a railed gas block that is higher or lower than the receiver. Proper alignment requires that the front sight is mounted at the same height plane as the rear sight.