Magpul MBUS Gen 2 Rear Flip Up Back Up Sight (MAG248)

Magpul

The MBUS (Magpul Back-Up Sight) is a low-cost, injection molded, folding back-up sight. The dual-aperture MBUS Rear Sight is adjustable for windage, and fits all Milspec 1913 Picatinny rail-equipped weapons but is specially tailored to the AR15/M4 platform.

$ 57.95