Troy BattleSight Front HK Folding, Flat Dark Earth Durability and dead-on accuracy have made Troy Industries Folding BattleSights the hands-down choice of Special Ops and tactical users worldwide. Easy to install and to deploy, with no levers or springs to fumble with, these sights position apertures at exact factory height. 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 (they fold to a profile of just 0.460). Troy BattleSights feature a zero-canting attachment system for use on all military and aftermarket receivers. No tools required for adjustment. Each click adjusts .50 MOA. Description Durability and dead-on accuracy have made Troy Industries Front Folding HK BattleSights the hands-down choice of Special Ops and tactical users worldwide. Note: Will not work on railed front gas block mounted lower than receiver height.