The FAB Defense FBS is an advanced, low-profile auxiliary front sight engineered for AR-15, M4, and M-16 platforms. It mounts directly to any 1913 Picatinny rail and functions as either a primary or back-up sight. The sight pin elevation adjusts quickly and easily without tools, while the ergonomic angle-wing-shaped front shroud centers the image with any rear sight. Pairing the FBS with a matching FAB Defense RBS Rear Back-up Sight creates a precise optical tunnel for more accurate aiming and faster target acquisition.
Construction combines high-grade polymer and metal components with an instant spring-locked deployment mechanism that resists slipping, breaking, and deformation. The low folded profile remains smooth and inconspicuous, preventing snagging on gear, webbing, or brush. The FBS delivers extreme optical advantage and reliable performance across demanding applications.
