Winchester 64631 Scope Mount w/Rings For XPR Medium Height 30mm Rings Black - Make sure your favorite Winchester firearm carries its scope with Winchester bases and rings. Designed and manufactured with absolute precision from 7000-series aircraft grade aluminum alloy, these mounts will hold today's high -magnification scopes without shifting zero. The XPR rifle scope set with integrated bases simplifies mounting and helps ensure your scope will stay zeroed in adverse conditions.