Magpul MBUS AR15 Sight Rear FDE

The Magpul MBUS AR15 Sight Rear FDE is a color injection molded folding backup sight engineered for AR-platform rifles and M16 variants equipped with 1913 Picatinny rails. This is the rear aperture component of Magpul's proven MBUS (Magpul Back-Up Sight) system—a cost-effective, mission-critical solution trusted by military units, law enforcement agencies, and professional shooters who require a reliable secondary sighting option when primary optics fail or require servicing.

The dual-aperture design provides both a small-aperture setting for precision shooting at distance and a large-aperture setting for close-quarters engagements, maximizing shot placement flexibility across combat distances. Windage adjustment is integrated into the sight body, allowing shooters to correct point-of-aim without tools or additional components. The folding mechanism keeps the sight clear of optic mounting space until deployed, reducing profile and eliminating unnecessary obstruction. At 0.13 lbs, the rear sight adds negligible weight. USA manufacture ensures consistent quality and parts availability through established domestic supply chains.

This rear sight is purpose-built for patrol carbines, duty rifles, tactical trainers, and any AR-pattern platform where proven, no-frills backup iron sights are essential doctrine. The FDE (Flat Dark Earth) finish coordinates with modern furniture standards and contemporary mil-spec color schemes. Operators deploying this sight alongside primary red-dot or magnified optics gain immediate transition capability without training overhead—the MBUS presents familiar aperture-based aiming that requires no user customization or calibration beyond the included windage adjustment.