TROY Industries BattleSight, Front Folding Sight, M4 Style, Picatinny, Black SSIG-FBS-FMBT-00 Durability and dead-on accuracy make Troy BattleSights(TM) the hands-down first choice of Special Ops and Tactical Users Worldwide. Troy's M4 Front Folding BattleSight is easy to install and deploy" with no levers or springs to fumble with. No tools required for adjustment.