You are probably aware, but here is a Harris adapter for mounting to a sling stud, but I have no experience with it, and I don't see many people using them since pic rail adapters have become so common. Harris makes a great bipod, but I am not sure about how steady a stud mount would be. To me it would be like mounting a pic rail with a single screw.
I added a pic rail to my HS Precision stock with no problems at all. videos on line make it easy.