The Leupold Mark Integral Mounting System (IMS) is a 1-piece picatinny-style mount with integral rings for your next bolt action or AR-15. The worlds most precise optics demand the best mounts. Leupold's Mark IMS mounts provide the strength and precision needed for any tactical or long range application. Features:STANAG fit provides more contact between the mount and railMachined recoil lugs on the bottom eliminates any shiftingOne-piece design eliminates failure points between rings and basesPrecision machining guarantees an exact fitModels with 20-MOA angle available for increased adjustment2-bolt design makes install and removal quick and repeatable