FAB Defense FX-RBS Rear Backup Sight for AR-15
Low-profile auxiliary rear sight with dual apertures (3mm and 1.5mm) for AR-15/M4/M16 platforms. Spring-locked deployment, durable polymer and metal construction, mounts on Picatinny rails.
FAB Defense FX-RBS Rear Backup Sight
The RBS represents a thoughtful approach to auxiliary sighting on the modern rifle. This low-profile rear sight mounts readily on any 1913 Picatinny rail, making it equally at home on AR-15, M4, or M16 platforms.
Key Features
- Dual Aperture System: Choose between a 3mm aperture for longer eye relief, low-light performance, and faster target acquisition, or a 1.5mm aperture for shorter eye relief and enhanced accuracy
- Spring-Locked Deployment: Instant, reliable deployment mechanism that won't slip, break, or deform under use
- Low-Profile Design: When folded, the sight remains smooth and inconspicuous—it won't snag on gear, webbing, or brush
- Durable Construction: High-grade polymer and metal materials built to withstand field use
- Ergonomic Design: The distinctive angel-wing-shaped front shroud helps center your sight picture with any compatible front sight
Versatile Mounting
Whether you're running this as a primary sight or a true backup system, the RBS integrates seamlessly into modern rifle setups. Its low-profile footprint makes it an excellent choice for shooters who want backup iron sights without the bulk.
This is a sight built for reliability and ease of use—qualities that matter when precision counts.
