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The Front Backup Sight is an advanced, low-profile, durable, auxiliary front sight.


STOCK: Available


The Front Backup Sight can be used with any rear sight but has been designed to provide an extreme optical advantage when paired with the FAB Defense® RBS Rear Back-up Sight. Sight pin elevation is easily and quickly adjusted without tools.

FBS is readily mounted on any 1913 Picatinny rail, making it ideal for use on M4 / AR-15 / M-16 platforms and on the FAB Defense® KPOS.


  • Can be used as a primary or backup sight
  • Ergonomic angel-wing-shaped front shroud helps centre the image with any rear sight, but when used with a matching FAB Defense®  RBS Rear Back-up Sight, it creates a precise optical tunnel that ensures more accurate aiming and faster target acquisition
  • The 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 elevation adjustments, with positive detent locking
  • Made of extremely durable high-grade polymer and metal


  • All 1913 Picatinny rails
  • The FBS should never be mounted on a railed gas block

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