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.
To make bullets spin so they fly straight.
Yes
Basically, a rifle with a shorter barrell.
The spiral grooves in a guns barrel are known as rifling. Its what puts a spin on the bullet as it leaves the barrel for accuracy. The grooves are called..... well, grooves. The ungrooved part between grooves is called a land. So looking through the barrel of a rifled firearm, you will see the "lands and grooves" that make up the rifling.
Most that I have seen are on the left side of the gun barrell near the bolt and trigger. Most that I have seen are on the left side of the gun barrell near the bolt and trigger.
on the muzzle end of the barrel there will be 3 grooves for the handgaurd/extension, if the barrel is smooth on the outside with no grooves it is a riot gun.
Your gun barrel dates to 1919 if it is a sxs double not stated in your ques.
Inexpensive.
On the INSIDE of the barrel, they are called grooves. Together with the ungrooved areas, called lands, they make up rifling. On the OUTSIDE of the barrel, they are called flutes. These are cuts made in the barrel to make it lighter.
Lands and grooves.
Grooves
Grooves on inside of the barrel= a RIFLED firearm- the grooves are known as rifling. Grooves on the outside of the barrel= fluting, done to reduce weight