What is the legal definition of a 'firearm' in California?

The legal definition of a 'firearm' in California is focused on the functionality and mechanism of the device. The correct choice outlines that a firearm is specifically a device designed to expel a projectile through a barrel utilizing explosive force. This definition emphasizes the critical aspects that distinguish firearms from other types of weapons or devices, such as bows or recreational items, which do not operate using explosive means. By involving explosive force, the term encompasses firearms like pistols, rifles, and shotguns, which are fundamentally constructed to discharge projectiles as a result of a chemical reaction during the process of firing.

This clear definition is essential for legal classifications, regulations, and law enforcement purposes, ensuring that individuals and entities understand what qualifies as a firearm under California law. It serves to delineate firearms from other weapons that may use mechanical or manual means to launch projectiles, thereby providing clarity in legal settings and at various points of regulation and ownership.