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.. Color - Black; .