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Model 12 front sling swivel
There are plenty of clamp on style shot gun front sling swivels, but the swivel is on the side. After seeing this picture, I think I can make one of these using an extra magazine band (or just the one on my gun) then cutting/forming/welding pieces of a 1903A3 upper sling swivel to it. Clean it up and either parkerize or Duracoat. Finding an original one of these may take some time. Then install on the shot gun.
My experience is limited but.....
It looks like a trench gun stock on a riot. my riot guns have never had a sling provision but my trench guns did. .02