Troy Industries' HK Front Folding BattleSights durability and dead-on accuracy make Troy BattleSights the hands-down first choice of Special Ops and tactical users. 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 and a push of a button folds the sights securely out of the way until you need them again. Requires front sight tool. Standard M16 A2 front sight.