Model 12 shotgun Sling Stud/assembly|Winchester Shotguns|Forum|Winchester Collector

Im not into the Model 12’s and dont know much about them other than using one for duck hunting a few times.  My father-in-law is a M12 collector and asked me if Winchester made a Model 12 sling assembly for their shotguns.   Is there such a thing out there?  I assume the sling eye for the buttstock would be like you would find on other lever action models, just wasnt sure if there was something that attached to the magazine tube, barrel, or other, on the front end of the shotgun.  Any help would be appreciated.   

Chris