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The spiraled grooves on the inside surface of the barrel, to force the projectile to rotate, which stabilizes it while in flight.

Ben, Rifling is the twist rate of the lands and groves measured in inches. This rifle has a 1 in 8 inch twist rate meaning the bullet will make one complete revolution in 8 inches of travel down the barrel. This inturn stabilizes the bullet for accuracy.

Ben, In firearms, rifling refers to the helical grooves that are machined into the internal (bore) surface of a gun's barrel, for the purpose of exerting torque and thus imparting a spin to a projectile around its longitudinal axis during shooting to improve performance and accuracy.