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Ruhsatını almak sıkıntıdır.
Evet.
https://en.wikipedia.org/wiki/Rifling

In firearms, rifling is machining helical grooves 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 stabilize the projectile longitudinally by conservation of angular momentum, improving its aerodynamic stability and accuracy over smoothbore designs.

Rifling of a 105 mm Royal Ordnance L7 tank gun.

görsel

Traditional rifling of a 9 mm handgun barrel .

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