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Expert Answer
These are meant to be used with scope rings so you can virtually sight-in your gun without moving the riflescope adjustments. The Burris Pos Align Offset Signature Inserts also correct for any misalignment caused by receiver holes drilled off center, or the bases or rings being slightly off perfect center. And for you 1000 yard and other long range shooters, the need for expensive tapered bases or shimming becomes a hassle and expense of the past.