The unique quick detachable design stops the metal swivel body from contacting the gun. The close machining tolerances provide smooth and silent operation. Super swivels do not include studs. All others include studs or barrel bands.Choose Uncle Mike's or risk a muzzle in the mud. We construct our swivels to be as strong and reliable as they come. With features the competition has been trying unsuccessfully to top since the days of Truman, when we pioneered the modern swivel. Pardon us for talking dirt about the other guys, but you could do a whole lot worse than Uncle Mike's. Features: For 1968 and older - adapter bolt swivel base replaces factory fore-end bolt without dismantling