Can be moved or taken off without permanent modification to the firearm; Stainless-steel cross-locking system ensures sights remain upright and zeroed under extreme combat conditions; Push of a button folds the sights securely out of the way until you need them again; Each click adjusts .50 MOA; Machined from hardened Aircraft Aluminum with stainless steel components; Finished in MIL-SPEC hardcoat anodizing; Black Finish