US Patent 8991551 Weapon silencers and baffles for weapon silencers

A baffle for a weapon silencer includes an annular wall that defines an axial passageway. The annular wall defines a first section located adjacent to a first axial end and in which the diameter of the axial passageway increases from a smallest diameter adjacent to the first axial end to a largest diameter. The annular wall defines a second section having a spiraled vane is formed on an exterior surface of the annular wall. The annular wall defines a third section that is located adjacent to the second axial end, the third section having a plurality of ports that extend radially through the annular wall to allow communication between the axial passageway and an exterior.