Description The Magpul MBUS Flip-Up Back Up Sight Gen 2, Black, MPIMAG247BLK-KIT2 Color: Black, Additional Features: Front, Gun Model: AR-15, Fabric/Material: Polymer, Attachment/Mount Type: MIL-STD 1913, Height: 0.51, Adjustment Click Value: 0.5, Length: 1.5 - 2.6, Weight: 1.3. Injection molded Impact resistant Spring loaded Windage adjustment Dual aperture Injection molded polymer