Cal. Pub. Res. Code § 4445

A person shall not fire or cause to be fired from any rifle or other device capable of discharging ammunition, any bullet, projectile, or other ammunition which contains the components of thermite, magnesium, or aluminum, or any other component capable of causing a fire and commonly known as tracer or incendiary ammunition within any forest-covered area, brush-covered area, grass-covered area or grain-covered area.