US Patent 10234230 Flash suppressor and flash suppressor assembly

A muzzle device assembly, including a flash suppressor, wherein the flash suppressor comprises a body having a central bore aperture, and wherein the flash suppressor comprises a plurality of air channel inlets and air channels, wherein the air channel inlets and air channels are in fluid communication with the central bore aperture; and a collar, wherein the collar comprises a plurality of airflow apertures, wherein each airflow aperture corresponds to an air channel inlet, and wherein the collar is rotatable between at least an open position and a closed position relative to the flash suppressor, wherein when the collar is in the open position at least a portion of each airflow aperture is aligned with each air channel inlet.