These elegant half octagon full ribbed barrels are quite common on German and Austrian sporting rifles and presumably were not outrageously costly. In the 1950s Austrian barrels of this description were imported into the US by Flaig's in Pennsylvania and they were not that much more expensive than round barrels. But today if you want one it has to be cut individually from the blank by one of our top machinist gunsmiths and the price is a couple of thousand bucks.