Colored Muzzle Flames are functional items available in almost all CF version. When equipped, they changes weapons' muzzle flash to the desired colors, which is nice to show-off on videos or simply to suit players' taste. CrossFire server with Challenge Mode often offers this item in Reward Crates. Other than that, players can buy them from the Item Shop. It is possible to own many of them but players can only use one for their current game.