Troy Industries 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. This HK Front Folding BattleSight is easy to install and deploy, with no levers or springs to fumble with, and no tools required for adjustment. It can be moved or taken off without permanent modification to the firearm. A stainless steel cross-locking system ensures sights remain upright and zeroed under extreme combat conditions. A push of a button folds the sight securely out of the way until you need them again. It is machined from hardened aircraft aluminum with stainless steel components and finished in MIL-SPEC hardcoat anodizing. Each click adjusts .50 MOA.