*Open Box* Dagger Defense flip up BUIS 45 degree picatinny rail mountedThe Dagger Defense 45 degree angled BUIS backup iron sights for use on standard picatinny rail mounts. A must have accessory for your picatinny rail systems. Has spring loaded, button activated flip up function to give you the extra advantage. Use in combination with red dots, holographic sights and scopes. Made of aluminum alloy. A great accessory for your tactical items. *These are an open box item, therefore there is a possibility of minor