Precision-engineered aluminum mounting rings designed for tactical optics with 25mm or 30mm tube diameters. This single-piece extended mount base delivers reliable scope positioning on top rail systems, constructed from durable aluminum for consistent performance in field conditions. The included insert accommodates both diameter specifications, eliminating the need for separate components. Weighing 230g, it provides substantial stability without excessive bulk. Finished in matte black for a professional tactical aesthetic. Manufactured by Aim-O under part number 10724306000.