FAB Defense FRBS Offset Rifle Sights Kit — Black

The FAB Defense FRBS Offset Rifle Sights Kit delivers a compact front-and-rear folding back-up sight system in black for use alongside magnified optics. Designed for offset mounting, these sights provide a rapid secondary sight picture while minimizing protrusion from the rail. Construction combines fiberglass-reinforced polymer and metal for a balance of durability and low weight. Both front and rear sights allow manual adjustments — windage for the rear and elevation for the front — without the need for tools.

Key Specifications

• Compatible with 1913 MIL-STD Picatinny rail.
• Fit specified as AR-15.
• Frame material listed as Polymer/Metal.
• Style described as Folding Offset Back-Up Sights.
• The length measures 52 mm.
• The width measures 32 mm.
• The height measures 14 mm.
• Length when deployed is 30 mm.
• Height when deployed is 42 mm.
• Weight given as 30 gr.

Compact, tool-free adjustments and an offset mounting profile make the FRBS kit a practical addition to modern AR-platform setups where a low-profile, reliable backup sighting solution is desired. The construction and streamlined design aim to keep the sighting system lightweight and unobtrusive while providing dependable manual adjustments when a secondary sight is needed.