Meprolight Flip-Up Front & Rear Tritium Sights


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The Meprolight FRBS is tritium-enhanced, self-illuminated front and rear back-up sights designed to provide the shooter secondary sights in case the primary optics go down. FRBS sights are advanced, low-profile, durable, tritium-enhanced auxiliary front and rear back-up sights. The front sight post elevation adjustment and rear sight windage adjustment is easily and quickly adjusted without tools. The FRBS M4D is readily mounted on any 1913 Picatinny rail, making it ideal for use on M4 / AR-15 / M-16 platforms. The tritium light source embedded in the front sight post along with four tritium inserts in the rear peep, ergonomic angel-wing-shaped front shroud helps create a precise optical tunnel that ensures a fast and accurate target acquisition, 


  • Made of extremely durable high-grade polymer and metal.
  • Low profile and lightweight design
  • Can be used as a primary or backup sight
  • Manually adjustable, no tools needed.
  • Spring-based locking mechanism
  • Compatible with all MIL-STD 1913 Picatinny rails.


  • Brand: Meprolight
  • Manufacturer part: 403200
  • Front Sight Color: Black w/Green Tritium
  • Additional Features: 4 Tritium Dots in Rear Sight
  • Rear Sight Color: Black w/Green Tritium
  • Material: Metal, Polymer
  • Height: 1.6 in
  • Type: Sight Set

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