Warne Vapor rails are designed to offer shooters an affordable and reliable mounting platform manufactured for your specific firearm. The V488-20MOA offers 20MOA of elevation built in for longer distance shooting. – Fits: Winchester XPR Short Action w/8-40 screw receiver. – Precision CNC machined from 6061/T6 aluminum – Mil-Spec hardcoat anodized finish for abrasion and corrosion resistance. – Self centering tapered T-15 Torx screws. – Fits Picatinny & weaver style rings and are NATO-STANAG compatible. – 20MOA – Tapered 8-40 Screws