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Rear Backup Iron Sight for use with the 57 mm/2.25″ and higher RD and RDF mounts. Attaches to the front of the mount body. Windage adjustable using two set screws.
https://mildot.fi/index.php/product/spuhr-a-0233/ (https://mildot.fi/index.php/product/spuhr-a-0233/)