Rifling
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Rifling is the term for helical grooves machined into the internal surface of a firearm's barrel for imparting a spin to the fired projectile to improve its aerodynamic stability and accuracy. It is a
Rifling of a 105 mm Royal Ordnance L7 tank gun
Conventional rifling of a 90 mm M75 cannon (production year 1891, Austria-Hungary)
Rifling in a GAU-8 autocannon
Traditional rifling of a 9 mm handgun barrel
Polygonal rifling
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Polygonal rifling is a type of gun barrel rifling where the traditional sharp-edged "lands and grooves" are replaced by less pronounced "hills and valleys", so the barrel bore has a polygonal cross-se
Canon de montagne de 4 modele 1859 Le Petulant
Hexagonal rifling of Le Petulant