Uncle Mike's Mag Band Shotgun Sling Swivel Set 800 to 850 Diameter
G&P Steel Barrel Clamp & QD Sling Mount Set for Shotguns, Accessories & Parts, External Parts, Sling Adapters - Evike.com Airsoft Superstore
Amazon.com: Gotical-Shotgun Mag Clamp with Sling Swivel 12 Gauge 1" Pack of 2 Shotgun Clamp New 1 Inch Shotgun Clamp Glass-Nylon Composite Used to Attach a Sling-Swivel to Some Shotguns (Black, 2Pcs)
Amazon.com : Nordic Pure Nordic Qd Mount for BBL Clamp Black Stock Accessories : Sports & Outdoors
ATI Shotgun Magazine Clamp with Sling Swivel 12 Gauge 1" Black SMC1100 [FC-758152511003] - Cheaper Than Dirt
92670 : Magazine Clamp W/Sling Swivel for Mossberg 930 12Ga Black