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I doubt you will find one but here is the kit you need to drill the existing mag tube cap and install the swivel on it https://byallen.com/product/sling-swivel-mounting-hardware-for-pump-semi-auto-shotguns/

Hey Mike this may be what youre looking for https://www.budsgunshop.com/catalog/product_info.php/products_id/44612/U.+Mikes+SLING+SWIVELS+QD+100+P-B

Michael, this is a Remington universal tube cap for 20 gauge tube. It is compatible to Browning Gold - Remington 870 20 ga. - Winchester 1200/1300 - Mossberg 835 - Browning BPS and most 20 gauge tubes.

These will fit most shotguns https://www.midwayusa.com/product/887160/uncle-mikes-sling-swivel-stud-115-rgs-set

midwayusa.com/product/887160/uncle-mikes-sling-swivel-stud-115-rgs-set will not work on semi-auto and pump shotguns as the forearm is to thin for the screw

here is the uncle mikes that will work http://www.unclemikes.com/products/accessories/shotgun-swivels/magnum-most-pumps-autos

Here is another way these clamp onto the barrel http://www.unclemikes.com/products/accessories/shotgun-swivels/magnum-single-over-unders