US Patent 10393462 Firearm barrels with integrated sound suppressors

The present disclosure relates to a firearm barrel assembly comprising: a barrel; a sleeve disposed within and spaced apart from the barrel and forming a chamber between the inner surface of the barrel and the outer surface of the sleeve; and a sound suppression assembly disposed within the sleeve and comprising at least one vent aperture in communication with the chamber such that shear and expanding gases from a fired bullet are directed into the chamber.