Extended Multi-Slot Bases Engineered for precision and versatility, the Extended Multi-Slot Bases from Weaver provide a reliable foundation for your optics setup. Constructed from aircraft-grade 6061-T6 aluminum and finished with a Type-III hard coat anodizing, these bases ensure maximum strength and durability. The extended design adds an extra inch of forward length, giving you more flexibility in mounting options, while maintaining compatibility with both Picatinny and Weaver-style rings. Key Features: Universal Compatibility: Designed to work seamlessly with Picatinny and Weaver-style rings for ultimate versatility. Enhanced Durability: Built from aircraft-grade 6061-T6 aluminum with a rugged Type-III hard coat anodized finish. Extended Design: Provides an additional inch of forward length to accommodate various optics setups. Proudly Made in the USA: Crafted with precision for exceptional performance and reliability. Weaver Recommended Torque Specs 6-48 Screws: 15 in lbs 8-40 Screws: 18 in lbs Instruction Manual