US Patent 10234231 Flash signature hider

Flash suppressors having at least one contracting and then expanding burn chamber are described. The contracting and then expanding burn chamber may include one or more ribbed surfaces that enhance burning of propellant gasses and ambient oxygen before the gasses exit the flash suppressor. In some examples, a burn chamber may include a spirally threaded inner and/or outer surface, which swirls and cools the propellant gasses to enhance burning before the propellant gasses exit from the flash suppressor.