The 556R/597R recoil pad, fits the 6-position butt-stock of the Archangel AA556R, M4-style conversion stock for the Ruger 10/22®, and the AA597R, M4-style Conversion Stock for the Remington 597®. Molded from a medium-hard elastomer, it provides a comfortable and secure fit of the butt-plate against the shoulder.