broach is the tool to cut rifling.
A pastry blender
A pizza cutter wheel is the best utensil to cut pizza with.
bandsaw
A barrel with ports cut in it.
The first gun with a rifled barrel (a rifle is any gun with grooves cut into the barrel to give the projectile spin) used by American forces was the Kentucky rifle, used in the revolutionary war.
You need to leave the barrel 16" or longer to be legal.
well i tried this once. if you cut off the head then poke its abdomen with a sharp utensil then it will explode
Cut it in half and then keep cutting it roughly in half until you have as many sections as you need.
Grooves cut into the inside of a gun barrel for the purpose of spinning the bullet when fired.
Stainless is harder.
Threaded
Grooves can be on the outside of the barrel- called fluting- and they are cut with a milling machine. Grooves can also be inside the barrel- that is the rifling. It is cut by a special tool. The earliest rifling tool cut one line at a time, gradually getting deeper and deeper. Now a rifling tool called a broach may be used- made of extremely hard material, it is pulled through the barrel by a machine, and cuts all of the rifling in one pass.