In firearms, rifling is machining helical grooves into the internal 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 stabilize the projectile longitudinally by conservation of angular momentum, improving its aerodynamic stability and accuracy over smoothbore designs.
Helical groovings in the internal surface of a firearm barrel
Process of grooving a gun barrel to increase a projectile's range and accuracy
The system of grooves in a rifled gun barrel or cannon. Shunt rifling, rifling for cannon, in which one side of the groove is made deeper than the other, to facilitate loading with shot having projections which enter by the deeper part of the grooves.