FRBS Offset/Flip-Up Sights

FAB DefenseSKU: fx-frbsosg
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Style: Right
Color: OD Green
Sale price 956 kr

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In stock


Whether for competition, duty or defense, optical system rule the day in terms of shooter preference. But optics do fail. To keep your carbine in the competition, the FAB Defense FRBS Offset kit provides an affordable backup sighting system.

The Front/Rear Backup Sight (FRBS) offers insurance for when an optic goes down. Mounted at a 45-degree, the system engages target for fast CQB work with a primary optic serving longer-range work. Many competitors and operators alike employ irons mounted on a 45, providing both options and security. The FAB models feature a snag-free, low-profile design while not in use. But for rapid deployment, they remain at the ready.

The FRBS Offset Sight utilizes hard fiberglass reinforced polymer construction. It proves cost effective, lightweight and durable. The kit takes up a single slot on a Picatinny rail system. It clamps securely into place with an Allen head screw. Options include right- or left-eye dominance.


  • Sleek design with minimal protruding parts
  • No tools needed for a quick and easy elevation and wind adjustment
  • RBS – Rear Back-up sight can be manually adjusted for windage
  • FBS – Front Back-up sight can be manually adjusted for elevation
  • Available in both right and left side variations
  • Durable fiberglass reinforced polymer and metal construction


Weight 59 gr
Width 57 mm
Height 26 mm
Length 51 mm
Width (open / deployed) 68 mm
Height (open / deployed) 44 mm
Length (open / deployed) 23 mm

FAB Defense

FAB Defense is a leading manufacturer of high-quality tactical gear and accessories. With over 25 years of experience in the industry, FAB Defense has been recognized for innovative and reliable products designed to meet the needs of both military and civilian users. Their extensive product range includes stocks, grips, rails, and more, all designed to enhance the functionality and performance of firearms. FAB Defense products undergo rigorous testing to ensure they can withstand the most demanding conditions. With a commitment to quality and customer satisfaction, FAB Defense continues to develop and improve their products to meet the ever-changing needs of their customers.

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