A flash suppressor is a device attached to the muzzle of a rifle or pistol that reduces its visible light signature while firing by cooling or dispersing the burning gases that exit the muzzle. The purpose of a flash suppressor — also referred to as a “flash hider” or “flash guard” — is to guard the shooter from a significant portion of the visible flash. Some states, such as California, Massachusetts, New York and New Jersey, have laws in place restricting the use of flash suppressors.
There are currently two primary types of flash suppressors: the duckbill and birdcage. The duckbill type has a number of prongs, while the birdcage type has a ring around its end for stability and to prevent the flash suppressor from being “caught up” on surrounding objects.