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I’d go with a barrel clamp mount sling stud. I did it on my Browning Cynergy. Works great.
I mounted one on the barrel of an old Sears single shot. Has worked out fine and has never moved. I ordered mine from grovetec I think. Measure the spot you want it to go with calipers. They come in different sizes.
Barrel micd at .922. Uncle Mikes say the 12ga size goes up to .900 so I'm still at a loss to do. Afraid they wont get tight enough. Its a Winchester 37A by the way
Correct Lacire