Christensen Arms Ultralight PRSR-X2 30mm Medium Scope Rings - Black Anodized - The PRSR-X2 ultralight precision scope mounting system- CNC-machined rings are designed to optimize performance between the scope and rifle with each and every shot. Standard 1/2in nut attachments to ensure secure and consistent clamping force. Fits Picatinny style mounts and are NATO-STANAG compatible.