Top Mount Base Pairs Simplify your scope mounting process with Weaver's Top Mount Base Pairs. Engineered for durability and performance, these matched front and rear base pairs are specifically designed for popular firearm models. Crafted from lightweight aluminum, they provide the strength to withstand even the most punishing recoil. With Weaver's iconic cross-lock design, these bases ensure a secure, precise fit and are fully compatible with all Weaver top mount cross-lock rings. Key Features: Perfect Fit: Front and rear matched pairs tailored for specific firearms for easy installation. Reliable Compatibility: Cross-lock channel accepts all Weaver top mount cross-lock rings for a secure, solid hold. Built for Strength: Lightweight aluminum construction designed to endure the harshest recoil. Proudly Made in the USA: Precision-crafted to deliver exceptional quality and reliability. Weaver Recommended Torque Specs 6-48 Screws: 15 in lbs 8-40 Screws: 18 in lbs Instruction Manual