Rifle, firearm with a rifled bore—i.e., having shallow spiral grooves reduce internal the barrel to impart a spin to the projectile, as a result stabilizing it in flight. A rifled barrel imparts a lot higher accuracy to a projectile, as in contrast with a smoothbore barrel.
Rifled firearms date returned to at least the fifteenth century. As some of the earliest had straight instead than spiral grooves. It is concept that the preliminary cause may also have been to get hold of the powder residue. Gun makers quickly discovered, however, that spiral grooves made bullets spin and that spinning expanded their vary and accuracy. The impact elevated when spherical balls have been outdated through somewhat-elongated projectiles.