FAB Defense BUIS with Tritium – 4 Rear Dots


FAB Defense BUIS with tritium inserts.  Every weapon with battery powered optics should have a backup system

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SKU: FRBS M4D-B Categories: , UPC: 840103149424


Every weapon with an optical sight should have an auxiliary sighting system. If your optic depends on batteries, auxiliary sights are an absolute necessity.


  • Designed for M4, M16 and AR-15 rifles, the KPOS system, and other weapons with same-plane mounting locations and similar sight height.
  • Rear sight is finger-adjustable for windage.
  • Front sight is finger-adjustable for elevation.
  • Low-profile, lightweight design.
  • May be used as primary or secondary sights.
  • Ambidextrous deployment and control.
  • High-grade polymer and metal construction.
  • Spring-based locking mechanism will not break or deform.
  • Mounts to MIL-STD-1913 Picatinny rails.
  • Front sight height designed for mounting to handguard on same plane as rear sight, not to AR-15 gas blocks.
  • Front sight weight: .88 oz.
  • Rear sight weight: 1 oz.

Carries FAB Defense’s Lifetime Replacement Guarantee

Additional information

Weight 0.223 lbs
Dimensions 9 × 3.5 × 1.5 in


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