The new 6mm ARC cartridge was designed for the U.S. DoD Multipurpose Combat Rifle program. It's a middle point between a .223 Rem in the AR15 platform and a .308 Win in the AR10 platform. The goal of the 6mm ARC is to offer a high-BC projectile in the AR15 platform. Depending on rifle specifics/setup, the end result is approximately 50% less recoil and 30% less weight than .308 Win, with an increase in magazine capacity.