Add sling swivels to pump and semi-auto shotguns without altering the gun. Factory-style, replacement magazine cap has swivel stud already installed. Includes a ¾" wood screw base for the buttstock and 1" QD sling swivels. Mfg: Uncle Mikes SPECS: Steel, black, low luster finish. Includes screws, swivels, magazine cap and instructions. Rem 870 - External tube ratchet (ER), internal tube ratchet (IR). For 12 gauge guns unless otherwise noted.