I was needing some kind of a adapter to use Harris bipods on my Sako TRG's without paying more. I still wanted to use the factory sling attachment so I could adjust it in the track of the stock. The factory sling stud hole diameter is still to large to lock up to, so I went to the hardware store and found this aluminum spacer. It is 1/4" long with a none threaded hole in it, fits into the Sako sling stud with a little play, and works perfect in fit with Harris bipods. Cost was .50 cents. Better than paying $20 for the Harris adapter. Nice way to go for you TRG owners needing a adapter.
