Remington 870 Swivel SetInternal Ratchet Cap - Fits Remington 870 Express Models Install a sling on your Rem 870. Front stud simply replaces the magazine cap. Rear stud is a simple drill and screw in the stud process. Kit include two 1" Quick Detach Swivels to fit any 1" wide sling. Note: The cap on this kit only fits 870s with INTERNAL ratchet magazine cap.