The Making of a Rifled Barrel, FirearmsID.com
2011-11-20 · THE MAKING OF A RIFLED BARREL. by ... The machinery is quite simple. The button is mounted on a long rod of high tensile steel which is passed through the barrel blank and attached to a large hydraulic ram. The button is mounted in a "rifling head" that rotates the button at the desired pitch or twist as the button is pulled through the barrel ...