MAGPUL MBUS Gen 2 Front Flip-Up Gun Sight is perfect for use with red dot sight and other optics in case your batteries fail or if you need to use iron sights. The attachment fits Mil-Spec 1913 Picatinny rails and is spring loaded to flip up quickly. Use the MAGPUL MBUS Front Flip Up Gen 2 Sight in conjunction with a red dot sight to use as 1/3 co-witness. Impact resistant polymer assures that the sight lasts even in most demanding situations. Whether in a the desert or in the frigid cold, the MagPul MBUS Gen 2 Front Flip Up Sight will be your trusted backup. Specifications for Magpul Industries MBUS Front Flip-Up Back Up Sight Gen 2: Manufacturer: Magpul Industries Condition: New Sight Mounting Orientation: Top Mounted Sight Position: Front Gun Model: AR-15 Gun Make: AR Platform Rear Sight Color: Front Sight Only Deployable: Yes Fabric/Material: Polymer Attachment/Mount Type: MIL-STD 1913 Height: 0.51 in Length: 1.5 - 2.6 in Illumination Type: Non-Illuminated Illumination Color: None Hand: Ambidextrous Adjustment Click Value: 1.2 MOA Weight: 4.2 oz Features of Magpul Industries MBUS Rear Flip-Up Back Up Sight Gen 2: The MBUS (Magpul® Back-Up Sight) is a low-cost, color injection molded, folding back-up sight. The dual aperture MBUS Rear Sight is adjustable for windage and fits most 1913 Picatinny rail equipped weapons, but is specifically tailored to the AR15 / M16 platform. . SPRING-LOADED FLIP UP SIGHT Spring-loaded flip up sight easily activated from either side or by pressing the top Protective wings shield the dual, same plane flip apertures Sight can still be folded with either large or small aperture in position Detent knob easily and positively adjusts windage IMPACT-RESISTANT POLYMER CONSTRUCTION Polymer construction provides light weight and resists operational abuse DETENT AND SPRING PRESSURE KEEPS SIGHT ERECT Detent and spring pressure keeps sight erect but allows for unobstructed folding under impact, etc. CLAMPS TO MOST MIL-STD-1913 PICATINNY RAILS Clamps to MIL-STD-1913 Picatinny/STANAG 4694 receiver rail and provides the same height-over-bore as standard A2 irons Package Contents: Magpul Industries MBUS Front Flip-Up Back Up Sight Gen 2