Front Polymer Folded Back-Up Sight - FAB DEFENSE


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Fab Defense

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Product Description


FBS is an advanced, dual aperture, durable and low-profile auxiliary front sight. It can be used with any sight and was designed for more accurate aiming and faster target acquisition. Windage is easily and quickly adjusted without tools.

FBS is readily mounted on any Picatinny rail, making it ideal for use on M4/M16/AR15 platforms and on the FAB KPOS.


  • Can be used as primary or back-up sight
  • Ergonomic angel-wing-shaped shroud helps center the image with any rear sight, and when used with a matching FAB RBS Rear Back-up Sight, it creates a precise optical tunnel that ensures more accurate aiming and faster target acquisition
  • Low folded profile is smooth and inconspicuous, and will not snag on gear, webbing, or brush
  • Instant spring-locked deployment mechanism will not slip, break or deform
  • No tools needed for easy, rapid windage adjustments, with positive detent locking
  • Made of extremely durable high-grade polymer and metal
  • Available in different colors


  • Picatinny rails


Additional Information

Additional Information

Manufacturer Fab Defense

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