The NcSTAR® SKS Micro Dot Rail Cover replaces the factory SKS cover. This SKS receiver cover features a small integrated optics rail and a micro dot reflex optic base that is compatible with NcSTAR Micro Dot optics. This SKS receiver optics cover and the NcSTAR DDAB Micro Red Dot reflex optic combo offers the lowest mounting positions for the Red Micro Dot to co-witness with the SKS iron sights.