Weaver Mounts Top Mount Base, Series 411, is a 2-piece base designed for Thompson Center rifles. Constructed from durable aluminum with a black finish, this base features a Weaver-style rail interface for reliable scope mounting compatibility. Includes mounting hardware for straightforward installation. A solid, precision-fit option for shooters seeking dependable base performance on their Thompson Center 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.