The Spuhr A-0233 RD/RDF Backup Iron Sight is a compact, precision-engineered rear sight designed specifically for use with red dot (RD) and RDF mounts that are 57 mm (2.25") tall or higher. Built with Spuhr's renowned attention to quality and rugged performance, the A-0233 features windage-adjustable components, allowing for fine-tuned alignment alongside your optic. This sight serves as a low-profile backup aiming solution, ensuring continued functionality even if your primary red dot fails. Spuhr RD/RDF Backup Iron Sight A-0233