Weaver Mounts Top Mount Base Pairs is a 2-piece base designed for Mossberg 500/835 shotguns. Constructed from durable aluminum with a matte black finish, this base features a Weaver-style rail interface for reliable scope mounting compatibility. A solid, precision-fit option for shooters seeking dependable base performance on their Mossberg 500/835 platform. Safety Note Always ensure the firearm is unloaded before installing or adjusting any optics or bases. Verify proper torque specifications during installation. Improper mounting may affect accuracy and safety.