Durability and dead-on accuracy make Troy BattleSights? the hands-down first choice of Special Ops and Tactical Users Worldwide. Troy?s Rear folding Folding BattleSight is easy to install and deploy, with no levers or springs to fumble with. No tools required for adjustment. Features: Sight 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 sights securely out of the way until you need them again. Machined from hardened Aircraft Aluminum with stainless steel components and finished in MIL-SPEC hardcoat anodizing. Each click adjusts .50 MOA.