FRBS Kit – Low-Profile Front & Rear Backup Sights

FRBS Kit – Advanced Low-Profile Front & Rear Backup Sights for AR-15/M4

The FRBS Kit is an advanced, low-profile auxiliary sight system, designed for maximum durability and optical efficiency when used together. Engineered for rapid target acquisition, the FBS (Front Backup Sight) features tool-free elevation adjustment, while the RBS (Rear Backup Sight) allows for manual windage correction. Built from fiberglass-reinforced polymer and metal, the FRBS Kit ensures resilience in harsh environments. Its spring-based locking mechanism prevents deformation, while the sleek design minimizes snags on gear and webbing. Compatible with all 1913 Picatinny rails, the FRBS Kit is an ideal solution for AR-15, M4, M16 platforms, and the FAB Defense® KPOS.

🔹 Key Features:
✔ Primary or Backup Sighting Solution – Can be used as a main or auxiliary sight
✔ Low-Profile Design – Minimal protrusion, won’t snag on gear or webbing
✔ Quick & Easy Adjustments – No tools required for elevation and windage adjustments
✔ Independent Adjustment – RBS (rear sight) adjusts windage, FBS (front sight) adjusts elevation
✔ Spring-Based Locking Mechanism – Prevents breakage and deformation
✔ Durable Construction – Fiberglass-reinforced polymer and metal components
✔ Secure Mounting – Attaches to any 1913 Picatinny rail

🔹 Compatibility:
✔ All 1913 Picatinny rails
❌ FBS (Front Sight) should NOT be mounted on a railed gas block