A flash suppressor, also known as a flash guard, flash eliminator, flash hider, or flash cone, is a device attached to the muzzle of a rifle that reduces its visible signature while firing by cooling or dispersing the burning gases that exit the muzzle, a phenomenon typical of carbine length weapons. Its primary intent is to reduce the chances that the shooter will be blinded in low light shooting conditions. Contrary to popular belief, it is only a minor secondary benefit if a flash suppressor reduces the intensity of the flash visible to the enemy.[1]
Although they are typically mounted in the same position and sometimes confused with each other, a flash suppressor is different from a muzzle brake. While the former is intended to reduce visible flash, a muzzle brake is designed to reduce painful recoil inherent to large cartridges and typically has no effect on visible flash.[2]