Suppressors do not completely eliminate muzzle flash, but they do reduce it significantly. Most of the flash that is seen is from unburned propellant gas and primer particles. A good suppressor will trap most of these particles and slow them down so that they don’t create a bright flash. Additionally, many suppressors also cause the barrel to “gases out” which further eliminates muzzle flash.
Suppressors do not eliminate muzzle flash; they merely reduce it. Muzzle flash is created by the burning of the propellant in the cartridge and typically lasts for a fraction of a second. While using a suppressor, some of the expanding gas will still escape from the barrel and will ignite, causing a bright flash.
Muzzle flash is often seen when using a suppressor, but it will vary depending on the type of suppressor used and the ammunition being fired. Some muzzle flashes are more visible than others, but in general, they will be reduced in intensity or completely hidden from view.