Made in America, these Winchester Model 70 Scope Mounts made by Talley Manufacturing offer a unique and simplified one-piece scope ring and base solution for Winchester Model 70 standard caliber action rifles with rear hole spacing of .860 inches . This simplified mounting system eliminates the possibility of an out of alignment interface or loose connection between the ring and base of traditional two-piece designs. Ultimately this provides more strength and durability than rival steel rings and bases, but with a lighter overall weight. Fully CNC machined from lightweight aircraft-grade aluminum to the industries tightest tolerances, this rigid scope mounting platform requires no lapping and is ready to go out of the box. Designed to fit Winchester Model 70 standard caliber action rifles with rear hole spacing of .860 inches. Mounts to receiver with 6-48″ length screws.