That seems to be the ticket! Thanks!Can you post a pix for those of us who are not familiar with your gun.Someone may know of a sling made just for your application.
They do make a type of sling that attaches with out any hardware.It has loops on each end that you attach to the pistol grip and barrel.I do not know the brand name but you could do an internet search.
Try this one
no swivel shotgun sling