EGW Browning A-Bolt long action scope bases offer the adaptability of a single-piece picatinny scope rail for your shotgun, eliminating the need for drilling or tapping. These bases are precision-engineered from extruded aluminum, 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 lightweight tactical mounts incorporate a milled center channel to reduce weight. The full-width cross-slots are precisely gauged to MIL-STD 1913 specifications with a tolerance of +/-0.002 inches. Constructed from ultra-durable, extruded 6061-T6 aluminum, 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 secure mounting. The EGW Browning A-Bolt long action scope base is a single-piece picatinny rail enabling effortless eye relief and scope adjustments, eliminating drilling or tapping Precision machined from 6061-T6 aluminum, this scope base offers high rigidity and features MIL-STD-1913 specification cross slots for secure picatinny or weaver ring mounting The package includes socket head Torx screws and a wrench for installation It is advised to apply 20 in-lb of torque and a drop of blue loctite