PC 16520-16590:
Firearm Classification Definitions

The firearm classification sections of California Penal Code Part 6, Title 1, establish the definitional boundaries that determine how a weapon is regulated throughout the state's firearms laws. Each classification carries distinct legal consequences for possession, purchase, transfer, and carry.^[1]

Firearm (PC 16520)

Section 16520 provides the broadest definition: a device designed to be used as a weapon, from which a projectile is expelled through a barrel by the force of an explosion or other form of combustion. This includes the frame or receiver of any such device. The definition is intentionally expansive, capturing both complete weapons and the serialized component that gives a weapon its legal identity. Antique firearms as defined in Section 16170 are generally excluded from this definition for most regulatory purposes.

Firearm Capable of Being Concealed (PC 16530)

Section 16530 defines a "firearm capable of being concealed upon the person" as any device designed to be used as a weapon, from which a projectile is expelled by any force, with a barrel less than 16 inches in length.^[2] This is the statutory test for concealability and is the primary dividing line between handguns and long guns. Firearms meeting this definition are subject to the Unsafe Handgun Act roster requirements, the one-in-30-day purchase restriction, and handgun-specific carry provisions.

Frame or Receiver (PC 16532)

Section 16532 defines "frame" and "receiver" as the component of a firearm that provides housing for the hammer, bolt or breechblock, and firing mechanism.^[3] This definition is critical because the frame or receiver is the serialized component and is itself treated as a "firearm" under Section 16520. Transfer of a frame or receiver requires the same DROS process as a complete firearm.

Firearm Safety Device (PC 16540)

Section 16540 defines a "firearm safety device" as a device other than a gun safe that locks and is designed to prevent the firearm from being operated without first deactivating the device.^[4] California requires that every firearm sold by a dealer be accompanied by a DOJ-approved firearm safety device or that the purchaser present proof of an approved storage container.

Practical Classification Framework

Together, these sections create a classification hierarchy. A device is first evaluated under Section 16520 to determine whether it is a "firearm" at all. If so, it is then classified under Section 16530 (concealable or not), under Sections 16880 and 17190 (rifle or shotgun), and may be further classified under special categories such as assault weapon (Sections 30510-30515), .50 BMG rifle (Section 30530), or machinegun (Section 16880). Each classification triggers a distinct regulatory framework.