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 mounts, reducing weight and positioning the optic closer to the barrel 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 round back short action scope bases ensure straightforward installation by fitting directly into factory mount holes, eliminating the need for drilling or tapping Precision-machined from hardened steel, these bases are compatible with picatinny or weaver rings, enhancing the versatility and reliability of scope mounting The heavy-duty version is 0.10 inches lower, reducing weight and enhancing accuracy It features cross slots per MIL-STD-1913 specifications and includes all necessary mounting hardware