Thompson Center Arms Cross-Slot Base engineered to fit T/C G1 Contender, G2 Contender, and SSK-50 factory drilled and tapped barrels. Constructed from high-tensile structural aluminum in an anodized matte black finish for glare and scratch resistance. Features a Cross-Slot style interface compatible with Weaver-style and standard cross-slot utility rings, utilizing a narrower mounting spacing and including factory mounting screws with an installation wrench. 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.