FAB Defense FXRBS Rear Back-Up Sight AR15 M16 M4 Dual Aperture Black UPC 7290105941992 | FAB AR Rear BUIS

FAB Defense iron insurance: FXRBS – Rear Back-Up Sight for AR-15/M16/M4 Dual Aperture Low Folded Profile Spring-Locked Deployment Black Polymer & Metal featuring UPC 7290105941992. FAB Rear BUIS. FXRBS – Optic orphan.

Compact folding rear sight: dual aperture (standard/precision) for versatile targeting, ultra-low 1.4" folded height clears LPVO/red dots, spring-loaded auto-lock deployment, windage adjustable, rugged black polymer/metal construction – essential BUIS for tactical AR platforms.

Key Features of FAB Defense FXRBS Rear Sight

• Dual Aperture: Close/far focus.
• Low Profile Fold: Optic overlay.
• Spring-Locked Deploy: Instant up.
• Picatinny Mount: Rail ready.
• Windage Adjustable: Zero zen.
• Black Polymer/Metal: Battle born.
• Tool-Free: Field flip.
• AR15/M4 Compatible: Mil-Spec mate.

Specifications - UPC 7290105941992

Reliable backup when optics fail – the FAB FXRBS delivers. The End