Leupold BackCountry cross-slot bases are made of 7075-T6 aluminum, making them some of our lightest and most rugged mounts yet. This BackCountry cross-slot base is designed to fit a Ruger American Short Action and accepts both Picatinny- and Weaver-style rings. Features a 20-MOA slope for long-range shooting applications.Specifications:Length: 5.90"Series: Cross-Slot BaseIncludes: Mounting HardwareMOA: 20Weight: 1.75 ozFirearm Fit: Ruger AmericanColor: Matte BlackMaterial: 7075 T-6 AluminumModel: BackCountryFirearm Type: RifleStyle: Cross-SlotRings Included: NoAction: Short