The MRDS Top Ring for the FAST LPVO attaches any number of micro red dot sights directly to the top of the LPVO scope mount (FAST LPVO sold separately). When used with a FAST Optic Adapter Plate (sold separately), the micro red dot will sit at the 12 oclock position and most (optic heights vary) will clear the scope.Features : Fits Unity FAST LPVO Mount 7075-T6 Aluminum Construction Type III Hardcoat Anodized, Flat Dark Earth For 30mm Optic Tubes