TROY Industries BattleSight, Folding Rear Sight, Black Finish SSIG-FBS-R0BT-00 Durability and dead-on accuracy make Troy BattleSights the hands-down first choice of Special Ops and Tactical Users Worldwide. Troy's Rear Folding BattleSight is easy to install and deploy" with no levers or springs to fumble with. No tools required for adjustment.