The Weaver 48938 Grand Slam Steel Dovetail Base is a robust 1-piece system specifically designed to securely lock a riflescope onto Winchester 70 Long Action (with the same hole spacing), 670 and 770 rifles. Constructed from high-quality steel, this base offers exceptional recoil resistance, ensuring that your scope remains securely mounted even under the most demanding conditions. Featuring a reliable dovetail locking system, this base provides an ultra-secure and positive lock on the rings, enhancing your shooting experience with added stability and confidence. Whether you're at the range or in the field, the Weaver 48938 Grand Slam Steel Dovetail Base delivers the durability and performance needed for precision shooting. Trust in Weaver's commitment to quality with this essential accessory for your firearm.