Warne Mfg 7817M: Made in the USA the Warne Skyline Precision Mount has been engineered from the ground up with the precision rifle shooter/competitor in mind. Machined from 7075 T6 aluminum billet, and featuring two integral recoil lugs along with four mounting crossbolts, the precision mount easily handles the rigors of competition or hard use environments. Its Stanag rail interface allows for more precise mount alignment, and return to zero capability than a traditional Mil Spec 1913 Picatinny interface while still being compatible with all picatinny rails. This model has 30mm rings and is compatible with your MSR rifle.