Penal Code 29180
(b) Commencing July 1, 2018, prior to manufacturing or assembling a firearm, a person manufacturing or assembling the firearm shall do all of the following:
(1) Apply to the Department of Justice for a unique serial number or other mark of identification pursuant to Section 29182.
(2)(A) Within 10 days of manufacturing or assembling a firearm in accordance with paragraph (1), the unique serial number or other mark of identification provided by the department shall be engraved or permanently affixed to the firearm in a manner that meets or exceeds the requirements imposed on licensed importers and licensed manufacturers of firearms pursuant to subsection (i) of Section 923 of Title 18 of the United States Code and regulations issued pursuant thereto.
(B) If the firearm is manufactured or assembled from polymer plastic, 3.7 ounces of material type 17-4 PH stainless steel shall be embedded within the plastic upon fabrication or construction with the unique serial number engraved or otherwise permanently affixed in a manner that meets or exceeds the requirements imposed on licensed importers and licensed manufacturers of firearms pursuant to subsection (i) of Section 923 of Title 18 of the United States Code and regulations issued pursuant thereto.
(3) After the serial number provided by the department is engraved or otherwise permanently affixed to the firearm, the person shall notify the department of that fact in a manner and within a time period specified by the department, and with sufficient information to identify the owner of the firearm, the unique serial number or mark of identification provided by the department, and the firearm in a manner prescribed by the department.
California Code of Regulations Title 11 Divison 5 Chapter 41 Article 6 Section 5519
A firearm manufactured or assembled from polymer plastic on or after July 1, 2018, shall contain its unique serial number on 3.7 ounces of material type 17-4 PH stainless steel. This stainless steel piece shall be embedded within the plastic receiver or frame upon the firearm's manufacture or assembly.
(b) Commencing July 1, 2018, prior to manufacturing or assembling a firearm, a person manufacturing or assembling the firearm shall do all of the following:
(1) Apply to the Department of Justice for a unique serial number or other mark of identification pursuant to Section 29182.
(2)(A) Within 10 days of manufacturing or assembling a firearm in accordance with paragraph (1), the unique serial number or other mark of identification provided by the department shall be engraved or permanently affixed to the firearm in a manner that meets or exceeds the requirements imposed on licensed importers and licensed manufacturers of firearms pursuant to subsection (i) of Section 923 of Title 18 of the United States Code and regulations issued pursuant thereto.
(B) If the firearm is manufactured or assembled from polymer plastic, 3.7 ounces of material type 17-4 PH stainless steel shall be embedded within the plastic upon fabrication or construction with the unique serial number engraved or otherwise permanently affixed in a manner that meets or exceeds the requirements imposed on licensed importers and licensed manufacturers of firearms pursuant to subsection (i) of Section 923 of Title 18 of the United States Code and regulations issued pursuant thereto.
(3) After the serial number provided by the department is engraved or otherwise permanently affixed to the firearm, the person shall notify the department of that fact in a manner and within a time period specified by the department, and with sufficient information to identify the owner of the firearm, the unique serial number or mark of identification provided by the department, and the firearm in a manner prescribed by the department.
California Code of Regulations Title 11 Divison 5 Chapter 41 Article 6 Section 5519
A firearm manufactured or assembled from polymer plastic on or after July 1, 2018, shall contain its unique serial number on 3.7 ounces of material type 17-4 PH stainless steel. This stainless steel piece shall be embedded within the plastic receiver or frame upon the firearm's manufacture or assembly.



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