TROY Industries BattleSight, Fixed Front Sight, M4 Style, Picatinny, Black Finish SSIG-FBS-FMBT-02 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 Fixed BattleSight" a permanent" rail-mounted alternative to a standard A2 sight" allows limitless mounting options on all-length rails with a serrated ramp.