On my gas guns its easy to put an MLoc or Arca-Swiss device so it clamps into my RRS ballhead. I have a cheap plastic stock Ruger American rifle I want to use my RRS set up with when I go hunting. Is there such a device that I can have both the Arca-Swiss to fit and lock into the RRS ballhead yet it still have a swivel studd for the sling? Is there a device that works without having to drill more holes in the factory stock? Links appreciated.