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This Signature Pos-Align +/- 0.020" Eccentric Offset Insert from Burris Optics allows you to virtually sight-in your gun without moving the scope adjustments when used in conjunction with one of the Signature scope rings. By keeping the internal optics centered, you'll see the scope's intended clarity, sharpness, and brightness. The offset insert also corrects for any misalignment caused by receiver holes drilled off center, or the bases or rings being slightly off perfect center. For long-distance shooters, the insert removes the need for tapered bases or shimming.