Thumb-Nut SPR Optics Mount for AR-Style Rifles Engineered for precision and performance, the Thumb-Nut SPR Optics Mount delivers the ideal height and forward cantilever for AR-style rifles. This mount is built to ensure accuracy and stability, making it a perfect choice for modern sporting rifles and tactical setups. Key Features: Improved Accuracy: Integral recoil lug base design enhances return-to-zero capability for consistent performance. Premium Construction: Machined from 6061-T6 aluminum for lightweight durability. Optimized Spacing: Features 2 5/8 inches between the rings for secure optic placement. Country of origin, China Weaver Recommended Torque Specs 6-48 Screws: 15 in lbs 8-40 Screws: 18 in lbs