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. Section 16520(d) excludes unloaded antique firearms, as defined in Section 16170(b), from the firearm definition for the provisions listed in that subdivision.

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 definition of concealability. Section 16530(b) allows a firearm meeting it also to be a short-barreled rifle or a short-barreled shotgun. Firearms meeting this definition are subject to handgun-specific carry provisions. Dealer sales are generally subject to the Unsafe Handgun Act roster requirements. Section 27535 generally limits purchase applications to those that would not result in the purchase of more than three firearms cumulatively within any 30-day period.

Frame or Receiver (27 CFR 478.12)

Under 27 CFR 478.12(a), a handgun frame provides housing or a structure for the component designed to hold back the hammer, striker, bolt, or similar energized component before firing. A receiver of a rifle, shotgun, or other projectile weapon other than a handgun provides housing or a structure for the primary component designed to block or seal the breech before firing.^[3] Section 16520(b) includes completed frames and receivers and firearm precursor parts in the definition of "firearm" for the provisions listed in that subdivision. 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 children and unauthorized users from firing a firearm.^[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 17090 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.