Magpul MBUS MAG246 MSRP $57.95
The MAG246 MBUS (Magpul Back Up Sight) is a robust and economical flip up rear iron sight solution in polymer. Extremely light at 1.3oz, the MBUS fits all Picatinny rail equipped weapons but is specifically tailored to the AR15/M16 system. Folds to 5/8" tall and is spring loaded to firmly snap into up position when released. The rear flip sight is adjustable for windage and utilizes both small and large apertures. One click adjust POI (Point of Impact) approximately 3/4" at 100 meters.