The Mark 4 2-piece base is precision-engineered to fit the Winchester 70, providing a solid and dependable foundation for your optic. Machined with exacting tolerances, these mounts ensure superior integrity with their proven cross-slot design, delivering reliable performance and secure scope attachment. Understanding the importance of the connection between your scope and firearm, Leupold has built these mounts to be just as rugged and dependable as the optics they secure. With a wide range of mounting systems to choose from, you'll find the perfect match for your firearm and shooting style. Made in the USA and designed to withstand a Lifetime of heavy use, Leupold mounts are built to perform in the toughest conditions, ensuring your setup remains steady and reliable.