FAB Defense FXFRBS Front/Rear Folding Back-Up Sights

The FAB Defense FXFRBS combines front and rear folding back-up sights in a low-profile design for AR-15, M16, and M4 platforms. The set mounts to 1913 Picatinny rails and uses durable polymer and metal construction for a practical sighting solution.

The rear sight provides two selectable apertures, while the folding design helps maintain a streamlined profile when the sights are not deployed.

Key Specifications

• The set includes front and rear folding back-up sights for a complete auxiliary sighting system.
• The sights are designed for AR-15, M16, and M4 platforms.
• Mounting is compatible with 1913 Picatinny rails.
• The frame combines polymer and metal for durable construction.
• The frame color is black.
• The rear sight uses dual apertures for selectable sighting options.
• The rear aperture sizes are 3 mm and 1.5 mm.
• The rear sight provides tool-free windage adjustment.
• The front sight features tool-free elevation adjustment with positive detent locking.
• The listed product weight is 0.225.

With front and rear units, low-profile folding operation, and selectable rear apertures, the FXFRBS provides a straightforward back-up sight configuration for compatible rifles and platforms.