The Weaver Mounts 48482 Top Mount Base Pairs are designed specifically for the Winchester XPR. These bases feature tough, lightweight aluminum construction that withstands powerful recoil. The cross lock design ensures a tight, secure fit on your firearm. They accept all Weaver top mount cross lock rings and mount to the receiver using 8-40" length screws.Key FeaturesMaterial: Constructed from lightweight aluminum for durability.Mount Type: Designed to mount directly to the receiver.Compatibility: Accepts all Weaver top mount cross lock rings.