(a) As used in this part, “firearm precursor part” means a component of a firearm that is necessary to build or assemble a firearm and is described in either of the following categories:
(1) An unfinished receiver, including both a single part receiver and a multiple part receiver, such as a receiver in an AR-10- or AR-15-style firearm. An unfinished receiver includes a receiver tube, a molded or shaped polymer frame or receiver, a metallic casting, a metallic forging, and a receiver flat, such as a Kalashnikov-style weapons system, Kalashnikov-style receiver channel, or a Browning-style receiver side plate.
(2) An unfinished handgun frame.
(b) The Department of Justice, consistent with this section, shall provide written guidance and pictorial diagrams demonstrating each category of firearm precursor part specified in subdivision (a).
(c) Firearm parts that can only be used on antique firearms, as defined in subdivision (c) of Section 16170, are not firearm precursor parts.
(d) A firearm precursor part is not a firearm or the frame or receiver thereof. A firearm precursor part that is attached or affixed to a firearm is not subject to the requirements of Chapter 1.5 (commencing with Section 30400) of Division 10 of Title 4 of Part 6 or Section 18010.
(Added by Stats. 2019, Ch. 730, Sec. 2. (AB 879) Effective January 1, 2020.)