Ar-15/M16 Rail Mount Quick Detach Sling Swivel - Qd Rail Mount Swivel For Ar-15/M-16 Black Anodized

From Brownells.com

Uniquely designed, quick-detach swivel mount limits rotational movement to help achieve optimum weapon balance and control with popular tactical slings. Attach anywhere along railed forearms; robust, aluminum clamping block with hex head cross-bolt locks mount securely to any Picatinny or Weaver-style rail platform. Extra heavy-duty, steel, push-button swivel removes quickly, so operator can break-away from the sling in emergency situations. Can be mounted for right- or left-hand use and adapts to 2- and 3-point sling configurations. Swivel rotation is limited to approximately 45deg to help stabilize the weapon and eliminate sling tangle.