California Ghost Gun Charges: PC 29180, AB 1621, and East Bay Weapons Defense

Ghost guns — privately-manufactured firearms without serial numbers — became one of California’s biggest weapons-law priorities over the past decade. What started as a niche hobbyist market for “80% receivers” turned into a significant category of unregulated firearm traffic. California responded with AB 879 (2018), AB 1621 (2022), and expanded ATF regulations under Rule 2021R-05F. This guide walks through California’s ghost gun statutes, the federal parallels, and how Alameda County prosecutes these cases.

Morris Law is an East Bay criminal defense firm serving Alameda County. Seth Morris was a Deputy Public Defender in Alameda County and defends firearms cases at both East Bay courthouses.

What Is a “Ghost Gun”?

The term “ghost gun” is not defined in California statute — it’s colloquial. In practice, it refers to any privately-manufactured firearm that lacks a serial number and therefore cannot be traced. Common ghost gun sources:

• 80% receivers: Partially-completed firearm receivers sold as raw metal (not legally a “firearm” pre-completion) that hobbyists finish machining at home
• Polymer 3D-printed firearms: Fully or partially 3D-printed firearms including some functional pistols and rifles
• Repurposed frames: Frames or receivers stripped of serial numbers or built from scratch by machinists

The concerning feature is untraceability — traditional firearm crime investigation relies heavily on tracing serial numbers back to original retail sale. Ghost guns eliminate that trail.

California’s Ghost Gun Statutes

PC §29180 — Serial Number Requirement (AB 879, 2018)

PC 29180 makes it a crime for any person who manufactures or assembles a firearm to fail to apply for and obtain a state-issued serial number from the California Department of Justice before assembly. Application must include:

• Name, address, and date of birth of the manufacturer
• Description of the firearm being manufactured
• Fingerprints and photograph
• Fee (approximately $30)

The DOJ issues a unique serial number that must be permanently engraved on the receiver before the firearm can be legally possessed. Violation: first offense misdemeanor (up to 1 year county jail), second or subsequent offense felony.

AB 1621 (2022) — Possession and Transfer Prohibition

AB 1621 expanded California’s ghost gun law to prohibit possession, sale, transfer, or receipt of any unserialized firearm frame or receiver. This dramatically expanded criminal exposure — no longer limited to manufacturers, but reaching anyone who possesses, sells, or receives unserialized parts.

Related California statutes

• PC 30400: Prohibits possession, sale, or manufacture of assault weapons
• PC 32310: Prohibits possession of large-capacity magazines
• PC 30605: Prohibits possession of assault weapons and .50 BMG rifles
• PC 25400 / PC 25850 / PC 29800: Cover concealed carry, loaded-in-public, and felon-in-possession — often stacked with ghost gun charges

Federal Ghost Gun Law

ATF Rule 2021R-05F

Effective August 2022, ATF Rule 2021R-05F significantly expanded federal firearms law to require serial numbers on all firearms, including privately manufactured ones. The rule reclassified many 80% receivers as “firearms” under federal law, requiring FFL sale, background check, and serial number.

18 U.S.C. §922(a)(1)(A)

Engaging in the business of dealing in firearms without a federal firearms license is a felony punishable by up to 5 years in federal prison. Ghost gun sellers who move enough product to constitute “dealing” face federal exposure.

18 U.S.C. §922(o)

Federal prohibition on manufacture, possession, transfer of machine guns after 1986. Many ghost guns include auto-sear parts that convert to fully-automatic — this triggers §922(o) exposure independently of California law.

How Alameda County Prosecutes Ghost Guns

Origination patterns

Ghost gun cases in Alameda County typically originate from: (1) traffic stops and vehicle searches revealing unserialized firearms, (2) home searches during warrant service for other offenses, (3) probation/parole searches with search terms, (4) undercover ATF/OPD purchases from ghost gun sellers.

The DA’s charging pattern

Alameda County DDAs assigned to the Firearms Unit review ghost gun arrests within 48 hours. Charging patterns depend on: (1) whether the defendant manufactured the gun or simply possessed it, (2) whether the ghost gun was used in commission of another offense, (3) defendant’s prior history, (4) quantity — multiple ghost guns suggest trafficking and drive felony filing.

Federal referral triggers

ATF and the U.S. Attorney’s Office for the Northern District of California work with Alameda County law enforcement on cases involving: (1) multiple ghost guns suggesting dealing without license, (2) auto-sear conversions to fully-automatic, (3) ghost guns used in serious violent offenses, (4) interstate trafficking patterns.

Defenses to Ghost Gun Charges

Not a “firearm” under statute

An 80% receiver in its raw pre-completion state is not a “firearm” under California PC 16520 or federal law (pre-2022 ATF rule). If the receiver was truly at 80% completion and not further worked on, it may not qualify as a firearm at all.

Illegal search

Vehicle and home searches leading to ghost gun discovery are challengeable under PC §1538.5. Common issues: warrant scope, exceeding search authority, warrantless entries. Suppression typically dismisses the case.

Lack of knowledge

The prosecution must prove knowing possession. For rental cars, borrowed vehicles, shared living spaces, and hidden storage, lack of knowledge is a real defense.

Application in process

PC 29180 requires application before assembly. A defendant who has applied for but not yet received a serial number occupies a gray zone that some courts have treated leniently — particularly for post-AB 1621 possession charges when the defendant was in the process of compliance.

Constitutional challenges

Some California ghost gun statutes have been challenged on Second Amendment grounds post-Bruen. These challenges are unsettled and case-specific but represent an active area of litigation.

Frequently Asked Questions

What is a ghost gun under California law?

“Ghost gun” is not defined in California statute — it’s a colloquial term for any privately-manufactured firearm without a serial number. California requires serial numbers on all firearms under PC 29180, and post-AB 1621 (2022), prohibits possession, sale, or transfer of unserialized firearm frames or receivers.

Is it legal to build your own gun in California?

Yes, but with strict conditions. Under PC 29180, you must apply for and obtain a state-issued serial number from the California DOJ before assembly. The number must be permanently engraved on the receiver. You cannot sell or transfer a self-manufactured firearm — it must remain in your personal possession.

What is an “80% receiver”?

An “80% receiver” is a partially-completed firearm receiver sold as a metal blank. In its raw state, it is not legally a firearm under either federal or California law. However, once machining is completed to make it functional, it becomes a firearm requiring a serial number under both state and federal law (post-2022 ATF rule).

Are 3D-printed guns illegal in California?

Not per se — but they must be serialized under PC 29180, which requires application and DOJ-issued serial number before assembly. Additionally, if the 3D-printed firearm qualifies as an “undetectable firearm” (undetectable by metal detector), it is prohibited under federal law regardless of serial number status.

What’s the penalty for possessing a ghost gun in California?

Under AB 1621, possession of an unserialized firearm frame or receiver is a misdemeanor or felony depending on circumstances. Felony triggers include prior convictions, multiple ghost guns, or ghost guns used in commission of another offense. Misdemeanor: up to 1 year county jail. Felony: 16 months to 3 years state prison.

Where in Alameda County are ghost gun cases heard?

Misdemeanor cases are arraigned at Wiley W. Manuel Courthouse (661 Washington Street, Oakland). Felony cases and cases with federal parallels go to René C. Davidson Courthouse (1225 Fallon Street, Oakland) or the Federal Building at 1301 Clay Street.

Can I still buy an 80% receiver in California?

After AB 1621 (2022), commercial retail sale of unserialized 80% receivers in California is heavily restricted. Existing 80% receivers held by residents must be either surrendered, destroyed, or serialized through the PC 29180 application process. Interstate commerce in unserialized receivers is prohibited under the 2022 ATF rule.

How much does ghost gun defense cost in Oakland?

Ghost gun defense in Alameda County typically runs $5,000-$15,000 for misdemeanor cases and $15,000-$40,000+ for felony cases. Cases with federal parallel prosecution or gang enhancements can exceed $75,000 due to expert witness needs and dual-jurisdiction complexity.

Talk to an East Bay Ghost Gun Defense Attorney

Ghost gun cases sit at the intersection of California and federal firearms law, and the statutory landscape has been changing rapidly since 2018. What was legal in 2017 may be a felony in 2026. Understanding which version of the law applies to your case is critical.

Morris Law’s East Bay offices — Oakland (2744 E 11th Street · (510) 824-8831) and Berkeley (2025 Rose Street, Suite 200 · (510) 225-9955) — handle Alameda County ghost gun cases at the Wiley Manuel and René C. Davidson courthouses, and federal parallel cases at the Northern District of California. Call (510) 330-0814 for a free 24/7 consultation.

Related East Bay Resources

• East Bay Weapons Charges (firm-wide)
• PC 25400 CCW Charges
• PC 29800 Felon in Possession
• PC 25850 Loaded Firearm in Public
• East Bay Federal Crime Defense