Magpul MAG276-BLK Mbus Pro Rear Folding Black Steel Adjustable

Magpul MAG276-BLK Mbus Pro Rear Folding Black Steel Adjustable - All-steel back-up sight for AR-style rails - Mbus Pro rear with dual aperture - Rear windage adjustment - Front elevation adjustment (tool-free) - Fits 1913 Picatinny rails, including those on rail-height gas blocks - Positive detents maintain the Mbus Pro Rear at standard AR sight height when in use - Steel rectangular sight post switchable between match and standard widths - Case hardened and finished with Melonite QPQ for wear and corrosion resistance