Looks like there are three options just recently released.
Stiller is making a 700 pattern receiver that takes Savage mags. The receivers are commercial.
http://www.scout.com/military/sniper...stiller-2500xr
Primal Rights is looking for people to sign up for a conversion that they would batch together if enough people sign up. Uses Marlin mags.
http://www.scout.com/military/sniper...ter-conversion
Ravage88 has a plans that he will send out to have the conversions done by your own smith. Uses a proprietary mag.
http://www.scout.com/military/sniper...of-your-choice
Ravage88 conversion is the BlackOps conversion from a couple of years ago. I don't know the whole story, and I can't find the old posts on The Hide- but long delays and lawsuits. I know Hoser looked at having this conversion, but the rifle didn't get done. Someone else here had the conversion done, but I forgot who it was? Since BlackOps isn't involved and your choice of smith can be used, does anyone have experience with the conversion from an engineering sense?
Hoser, have you given up on conversions?