Uncle Mike's Quick Detachable Ruger Auto and Single Shot Carbines Sling Swivels (Blued, 1-Inch Loop) The unique quick detachable (QD) design stops the metal swivel body from contacting the gun The close Machining tolerances provide smooth and silent operation For end adapter with stud installed in the barrel band of gun Fore-end adapter fits barrel band of 10/22, .44 Mag. and No. 3 carbines " wood screw for fore-end stock mounting Swivel Lock spring-loaded plunger and a knurled, threaded sleeve eliminates accidental opening of the swivel