Burris Optics XTR Signature Rings 420221 deliver unmatched performance for tactical shooters, combining robust holding power with a lightweight design. Engineered for precision alignment, this tactical scope mount includes multiple MOA inserts for enhanced accuracy. The set features concentric MOA options, allowing customizable elevation adjustments. Corrects misalignment caused by off-center receiver holes No need for expensive tapered bases or shimming for thousand-yard shooting Versatile engagement from 0 to 40 MOA of cant Elevate your shooting accuracy with Burris Optics XTR Signature Rings, the ultimate choice for precision and reliability.