EGW Savage 10 - 16-rounds back short action Heavy Duty Steel scope bases offer the adaptability of a one-piece picatinny scope rail for your shotgun, eliminating the need for drilling or tapping. These bases are precision-engineered from hardened steel, featuring picatinny slot-and-rail spacing that facilitates quick and straight forward adjustments to eye relief, providing extensive flexibility in scope selection. They are pre-drilled to align with the factory scope mount holes on the firearm's receiver and are compatible with both picatinny and weaver scope rings. The Heavy Duty (HD) mounts are designed to be 0.1 inches lower than the lightweight variants, reducing weight and positioning the optic closer to the barrel's centerline, thereby enhancing accuracy. The full-width cross-slots are manufactured to MIL-STD 1913 specifications with a tolerance of +/-0.002 inches. Constructed from ultra-rigid 4140 carbon steel, these bases are pre-hardened to RC 35-35 prior to machining. The package includes socket head Torx screws and a wrench. EGW advises applying 20 in-lb of torque and a drop of blue Loctite for optimal installation. The EGW Savage 10-16 round back short action HD scope bases offer a seamless single-piece picatinny rail, facilitating effortless scope mounting without the need for drilling or tapping Engineered from hardened steel for enhanced durability, these bases accommodate picatinny or weaver rings and align with factory mounting holes The heavy-duty model is 0.10 inches lower than lightweight versions, featuring full-width cross slots per MIL-STD-1913 specifications and includes all necessary mounting hardware