Leupold (49904)

To use a riflescope you'll need a mounting base and mounting rings. There are a large variety of mounting systems available to choose from, each with different advantages & disadvantages. Leupold's STD rings are engineered to match with their STD one & two-piece mounting bases, and are available in five different ring heights(the distance measured from the center of the ring to the point of contact with the base).