I recently installed 30MM signature Z's on a Picatinny rail. They came equipped with Torx head mounting screws. Much nicer looking than the slotted screw & the same size Torx as the ring caps. Its possible the Torx head will inter-change with the slotted head on the 1 inch rings. Give Burris CS a call. Nice people to work with......... P.S. let us all know if the Torx can be inter-changed. Inquiring minds want to know :)