FAB Defense RBS Folding Rear Backup Sight, Black - FX-RBS

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FAB Defense RBS Folding Rear Backup Sight, Black - FX-RBS


Quick Overview

SKU: 165451214
UPC: 7290105941992
  • Attachment: Picatinny Rail
  • Material: Polymer
  • Finish: Matte Black
  • Height: 0.55"
  • Deployed Height: 1.65"
  • Length: 2.04"

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The Fab Defense RBS is an advanced, dual aperture, durable and low-profile rear backup sight. It can be used with any front sight and was designed for more accurate aiming and faster target acquisition. Windage is easily and quickly adjusted without tools. The RBS is readily mounted on any 1913 Picatinny rail, making it ideal for use on AR-15 platforms and on the FAB Defense KPOS. An ergonomic angel-wing shaped shroud helps center the image with any front sight, and when used with a matching FAB Defense FBS front backup sight, it creates a precise optical tunnel that ensures more accurate aiming and faster target acquisition.


  • 3mm and 1.5mm aperture for different light levels
  • Instant spring locked deployment mechanism
  • No tools needed for adjustment
  • Low profile when folded, will not catch on gear or webbing
SKU: 165451214
SKU 165451214
Department AR Parts
Brand FAB Defense
Daily Deal No
Daily Deal Expires No
Unit Price N/A
Youtube Video No
Free Shipping? No
Free Shipping Qty Label No
Free Shipping Qty No
SKU: 165451214

Questions and Answers

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Browse 1 question Browse 1 question
Is this the same height as an FSB? Will it align?
Daniel on Jul 29, 2019


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