US Patent 9494397 Polymer projectile having an integrated driving band

A lightweight projectile having an integrated driving band positioned around the exterior of the polymer base of the projectile for engaging the rifling of a barrel to impart spin stabilization to the projectile. The driving band protrudes from the polymer base to minimize the contact between the polymer base and the rifling to reduce friction between the barrel and the projectile as the projectile is fired. The reduced friction allows the lightweight projectile to be propelled with minimal propellant force while still retaining the ballistic advantages of a spin stabilized projectile.