Compatible with Winchester 70, 670, 770 and 770A models, the Leupold 2-Piece Reversible Weaver Base offers maximum accessibility to the magazine or breech area of your rifle. The reversible, fluted design offers a custom look and accommodates a variety of scopes and action lengths. Leupold 2-Piece Reversible Weaver Base Black - Scope Rngs And Rifle Accessories at Academy Sports