The Weaver 48909 Grand Slam Steel Dovetail Base is a reliable 2-piece system designed specifically for securely mounting a riflescope onto the Winchester 70 (.860 Spacing) rifle. Crafted from durable steel, this base offers exceptional recoil resistance, ensuring your optic remains stable and securely in place during use. Featuring a dovetail locking system, the Grand Slam base provides an ultra-secure and positive lock for your scope rings, enhancing the overall performance and reliability of your setup. Trust the Weaver Grand Slam Steel Dovetail Base for a robust and dependable mounting solution that meets the demands of serious shooters.