Now you can add sling swivels to your favorite pump or auto without altering your shotgun. The Uncle Mikes Swivels QD REM 870 1in Ext Ratchet Cap Set Blued has a factory magazine cap with the swivel base already installed. Just unscrew the factory magazine cap and replace it with the new cap. These swivels fit the Remington 870 (with conventional ball and detent lug system). It includes replacement magazine cap with swivel base, 0.75 inch wood screw buttstock swivel base and two Super Swivels.