The Leupold Mark 4 8-40 Adaptable Steel Scope Base 20 MOA from Leupold is engineered for serious shooters who demand reliability and performance from their mounting systems, and its 1-Piece design in Matte Black provides a solid foundation for demanding long-range setups such as Weatherby Vanguard SA and other high-caliber rifles. This base accommodates both robust 8-40 screws and conventional 6-48 shoulder screws, strengthening the mount by 41 percent to securely handle heavy recoil while maintaining repeatable zero. The 20 MOA elevation is a clear advantage for long-distance shooting, enabling precise dialing adjustments that translate into tighter groups in the field. Built to withstand rugged field conditions, the base delivers a secure, drop-in fit on compatible platforms without modifications, ensuring optics stay locked in under heavy recoil. Whether youre a seasoned hunter pursuing distant game or a competitive shooter dialing in accurate windage and elevation, this adaptable steel base lets you tailor your setup to your preferred rifles and mounting preferences, backed by Leupolds legacy of quality and durability for dependable performance.