Bought a rifling button in 5.6mm to make .22 barrels but i thought the 5.6mm were going to be the cutting flutes but it is the size of the pilot guide and
Building a Barrel Rifling Machine
Push button rifling - making a rifled barrel
Rifling tools
Rifling Machine - HomemadeTools.net
Gunsmithing | A curious way to rifle a barrel.... | Practical Machinist - Largest Manufacturing Technology Forum on the Web