Remage and savage guys have been doing this for a long time and probably far far more accurately. Nothing new, other than putting the word out to the general public with a less expensive package and one ugly a^% stock.
One issue is that you can buy a complete gun, for what the price of a barrel! And that's assuming you have the correct bolt for the caliber! If you don't have the correct bolt, it's probably over $400 for a caliber.!