If I was going to buy the receiver, bolt, and floorplate, etc., I would just by a mil surplus gun, and use it. I would say you can probably buy one for what the separate parts will cost, since those are marked up a good amount. That is, unless you can find an entire action, less barrel, or maybe an entire rifle, with a bad barrel, for cheap. It is also according to who made it, on what it will cost. German manufacture is the highest priced.