Entire base/ring is one integrated piece that mounts directly to the reciever. Like part of the receiver. These components virtually become a part of your Winchester XPR. The tight connection and one-piece design lock in your scope for the consistency and accuracy you demand. Integrated bases and rings are an excellent way to mount your scope closer to the bore centerline as well. Cold or hot, rough and tumble. XPR integrated bases and rings are very secure. They help ensure your scope will stay zeroed in no matter the adverse conditions and wild weather.exceptional over time.