Amazon.com : flipfit QD Sling Swivel Mount 1.25 inch,Quick Detach Push Button,Pack of 2,for Two Ponit Sling and Traditional Sling Swivel - Black : Sports & Outdoors
Lever Action Rifle Detachable Sling Swivels w Magazine Tube Dia of .540"- 590" | eBay
Uncle Mike's Quick Detachable Sling Swivel Set Mag Tubes .630-.675
NECG Quick-Detachable Sling Swivel Set (2), Slings & Swivels | New England Custom Gun Service, Ltd.