Christensen Arms 810-00041-04: Presenting the PRSR-X2 ultralight precision scope mounting system. These CNC-machined rings are engineered to enhance the synergy between the scope and rifle for every single shot. They feature standard 1/2\" nut attachments to provide a reliable and constant clamping force. Compatibility includes Picatinny style mounts and they\'re as per NATO-STANAG standards.