Civ. Code, § 3273.60

As used in this title, the following definitions apply:

(a) “Digital firearm manufacturing code” means any digital instructions in the form of computer-aided design files, computer-aided manufacturing files, or other code or instructions stored and displayed in electronic format as a digital model that may be used to program a CNC milling machine, a three-dimensional printer, or a similar machine, to manufacture or produce any of the following:

(1) A firearm, including a completed frame or receiver or a firearm precursor part.

(2) A large-capacity magazine, as defined in Section 16740 of the Penal Code.

(3) A large-capacity magazine conversion kit, as defined in Section 32311 of the Penal Code.

(4) A machinegun, as defined in Section 16880 of the Penal Code, including devices commonly known as switches or auto-sear devices.

(5) A multiburst trigger activator, as defined in Section 16930 of the Penal Code.

(6) A silencer, as defined in Section 17210 of the Penal Code.

(7) A firearm accessory, as defined in Section 3273.50.

(8) A firearm barrel.

(b) “Federally licensed firearms manufacturer” means a person, firm, corporation, or other entity that holds a valid license to manufacture firearms issued pursuant to Chapter 44 (commencing with Section 921) of Part I of Title 18 of the United States Code and regulations issued pursuant thereto.

(c) “Firearm” has the same meaning as in subdivisions (a) and (b) of Section 16520 of the Penal Code.

(d) “Three-dimensional printer” means a computer-aided manufacturing device capable of producing a three-dimensional object from a three-dimensional digital model through an additive manufacturing process that involves the layering of two-dimensional cross sections formed of a resin or similar material that are fused together to form a three-dimensional object.