FAB Defense Rear Back-Up Sight for AR-15/ M16/ M4 Dual Aperture Low Folded Profile Spring-Locked Deployment Black Polymer & Metal FXRBS

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 SpecificationDetail PlatformAR-15/M16/M4 ApertureDual Folded HeightLow Profile MaterialPolymer & Metal AdjustmentWindage MountPicatinny Reliable backup when optics fail – the FAB FXRBS delivers. The End