When you buy a gun in California everything about you and the gun is recorded in Sacramento.
12077. (a) The Department of Justice shall prescribe the form of the register and the record of electronic or telephonic transfer pursuant to Section 12074.
(b)(1) For handguns, information contained in the register or record of electronic or telephonic transfer shall be the date and time of sale, make of firearm, peace officer exemption status pursuant to subdivision (a) of Section 12078 and the agency name, dealer waiting period exemption pursuant to subdivision (n) of Section 12078, dangerous weapons permitholder waiting period exemption pursuant to subdivision (r) of Section 12078, curio and relic waiting period exemption pursuant to subdivision (t) of Section 12078, California Firearms Dealer number issued pursuant to Section 12071, for transactions occurring prior to January 1, 2003, the purchaser's basic firearms safety certificate number issued pursuant to Sections 12805 and 12809, for transactions occurring on or after January 1, 2003, the purchaser's handgun safety certificate number issued pursuant to Article 8 (commencing with Section 12800), manufacturer's name if stamped on the firearm, model name or number, if stamped on the firearm, if applicable, serial number, other number (if more than one serial number is stamped on the firearm), any identification number or mark assigned to the firearm pursuant to Section 12092, caliber, type of firearm, if the firearm is new or used, barrel length, color of the firearm, full name of purchaser, purchaser's complete date of birth, purchaser's local address, if current address is temporary, complete permanent address of purchaser, identification of purchaser, purchaser's place of birth (state or country), purchaser's complete telephone number, purchaser's occupation, purchaser's sex, purchaser's physical description, all legal names and aliases ever used by the purchaser, yes or no answer to questions that prohibit purchase including, but not limited to, conviction of a felony as described in Section 12021 or an offense described in Section 12021.1, the purchaser's status as a person described in Section 8100 of the Welfare and Institutions Code, whether the purchaser is a person who has been adjudicated by a court to be a danger to others or found not guilty by reason of insanity, whether the purchaser is a person who has been found incompetent to stand trial or placed under conservatorship by a court pursuant to Section 8103 of the Welfare and Institutions Code, signature of purchaser, signature of salesperson (as a witness to the purchaser's signature), name and complete address of the dealer or firm selling the firearm as shown on the dealer's license, the establishment number, if assigned, the dealer's complete business telephone number, any information required by Section 12082, any information required to determine whether or not paragraph (6) of subdivision (c) of Section 12072 applies, and a statement of the penalties for any person signing a fictitious name or address or for knowingly furnishing any incorrect information or for knowingly omitting any information required to be provided for the register.
