The Leupold steel standard bases are the most versatile of any mounting system we offer. The rear ring is secured by windage adjustment screws, allowing the scope’s internal adjustments to be used for precise sight-in. This specific model fits a Winchester 70 Long Range Pre 2003. Features 15 MOA cant in base. STD rings come in five different heights and are precision engineered to match up with STD 1-piece or 2-piece bases.