Like part of the receiver. These bases with rings integral with the base 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. Which means they help ensure your scope will stay zeroed in no matter the adverse conditions and wild weather. How secure? Nothing is totally bullet proof, but this design have proven exceptional over time..