... there is about to be a number of kit for sale that may interest you. FWRA on the FALfiles is about to offer up a bunch of heavy barrel kits. He has not listed the country of origin, but they will not be the Israeli ones. They are what are called the 50.41 configuration and are extremely rare. The kits he will have are unissued parts! They are not from de-milled rifles so condition will be beyond compare. They may have scratches and dings from storage and shipping, but that's it.
Price has not been released yet, but my hunch is they will come in between $600 to $700.
You may also want to consider buying a receiver now. The DSA group buy goes on for another 2 weeks and FAC has all models IN STOCK. Those Coonan receivers are hard to get but he has them for $200. If you're thinking about a build in the next 12 months, pick one up now.