Spiral grooves cut into the barrel of a gun in order to make a bullet spin as it is fired are known as what?

Rifling

Explanation:

Rifling usually refers to the process by which the spiral staircase groovings are being cut into the barrels of revolvers, guns, and pistols. It is used in order to spin the bullet at about 3000 revolutions per second along its axis (axis of length), during the time of shooting or firing. This spinning of the bullet due to the cutting of spiral grooves inside the barrel is commonly known as the process of rifling.

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