Magpul MBUS Gen 2 Rear Sight - Black
The Magpul MBUS (Magpul Back-Up Sight) Gen 2 is a low-cost, color injection molded, folding back-up sight. The dual aperture MBUS Rear Sight is adjustable for windage and fits all Mil-Std-1913 Picatinny Rails and has the standard AR-15 sight height.
The sight has a spring loaded lever that securely locks it in the up or down position. Simply pull down on the lever and sight springs into the up position. Pull down on the lever again to unlock and fold the sight down. Has a large rear aperture and a small aperture that folds into it. Windage adjustments are easily made by hand using the knob on the right side.