By the The Bulldog Law Criminal Defense Team  •  Reviewed by a licensed California criminal defense attorney

Penal Code § 30605 makes possessing an ASSAULT WEAPON a WOBBLER up to a year in county jail as a misdemeanor, or 16 months, 2, or 3 years as a felony, charged PER WEAPON with a narrow first-offense leniency lane the statute itself provides for qualifying minimal cases.The trap is the definition: California's “assault weapon” is defined by FEATURES, not firepower a centerfire semiautomatic rifle with a DETACHABLE magazine plus any ONE listed feature (pistol grip that protrudes conspicuously, flash suppressor, folding or telescoping stock, forward grip, and more), fixed-magazine rifles over ten rounds, listed named models, and parallel pistol and shotgun definitions - which means the ordinary AR-platform rifle that's lawful in 44 states becomes a California crime the moment it crosses the border in its factory configuration.

That's why these files are full of people who never imagined themselves defendants: the NEW RESIDENT who moved with the rifle they'd owned for a decade, the INHERITOR of a parent's firearm, the PRIVATE-PARTY BUYER who didn't know a bullet-button-era build from a compliant one, and the owner whose registration window (the state has opened and closed several) passed unnoticed.

Two more facts frame every case: the ban is under ACTIVE FEDERAL LITIGATION (Second Amendment challenges have gone up and down the Ninth Circuit for years - the ban remains enforceable while appeals proceed, and “it's unconstitutional” is an appellate argument, not a street defense); and California case law requires the prosecution to prove you KNEW OR REASONABLY SHOULD HAVE KNOWN the firearm had the characteristics making it an assault weapon a genuine knowledge element that acquits genuine ignorance of a technical configuration. This guide from The Bulldog Law's firearm offenses practice covers the definitions, the compliance lanes, the traps, and the defenses.

What Makes a Rifle an “Assault Weapon” and the Compliance Lanes

• The features test (the main event): centerfire semiauto rifle + detachable magazine + any one feature (conspicuous pistol grip, flash hider, folding/telescoping stock, forward pistol grip, grenade/flare launcher); semiauto pistols and shotguns have parallel lists; fixed magazines over 10 rounds qualify regardless of features.
• The named lists specific make/model designations from the original bans remain prohibited by name regardless of configuration.
• The FEATURELESS lane remove every listed feature (fin grips instead of pistol grips, fixed stocks, muzzle brakes instead of flash hiders) and a detachable-magazine rifle is NOT an assault weapon: the configuration thousands of Californians lawfully run, and the conversion path that turns contraband into compliance.
• The FIXED-MAGAZINE lane permanently limit the magazine (modern compliant systems require disassembly to reload) and keep the features: the other lawful configuration with the history note that the old “bullet button” era ended in 2016, converting once-legal builds into assault weapons overnight and driving a registration window that has since CLOSED.
• Registered assault weapons lawfully registered AWs from past windows remain possessable under strict conditions (no transfer within California, transport and use limits) and condition violations are their own charges.
• The neighbors large-capacity magazines (§ 32310, its own litigation saga), the prohibited-person stack (a felon with an AW faces both counts), and carry and transport rules that apply on top of ownership legality.

Defenses and the Right Moves for People Holding One Now

1. Not an assault weapon as configured the features analysis is technical and officers get it wrong: grip geometry, brake-versus-hider distinctions, magazine-lock compliance a defense firearms examiner's report answers a police report's checkbox, and configuration cases dismiss on it.
2. The knowledge element the prosecution must prove you knew or reasonably should have known the characteristics: the inheritor, the private-party buyer of a modified rifle, and the owner of a pre-2016 build with a since-outlawed configuration all have genuine ignorance defenses the case law respects.
3. Possession attribution the shared safe, the storage unit, the roommate's rifle: dominion-and-control fights run exactly as in every firearm case.
4. Search and seizure these discoveries ride on warrants, probation searches, and vehicle stops; suppression litigation is the first audit.
5. Resolution architecture - wobbler advocacy (misdemeanor filings and 17(b) reductions are realistic for good-faith cases), the statute's own first-offense leniency lane where it fits, compliance-conversion and surrender as mitigation, and - because a FELONY here means a lifetime firearm ban - keeping the case at misdemeanor level protects far more than the jail math.
6. FOR ANYONE READING THIS BEFORE ANY CASE EXISTS: if you've moved here or inherited a rifle that might qualify, your lawful options are conversion to featureless or fixed-magazine configuration, sale out of state through a dealer, or surrender - handled proactively, none of them involves a courtroom; handled after a traffic stop, all of them do. And if charges have already landed: no statements about what you knew, and get the configuration examined before anyone concedes it's what the report says it is.

Frequently Asked Questions

Is an AR-15 legal in California?

In compliant configuration yes: thousands are lawfully owned as FEATURELESS builds (no pistol grip, flash hider, or other listed features, detachable magazine allowed) or FIXED-MAGAZINE builds (features kept, magazine permanently limited to 10 and requiring disassembly to reload). The factory configuration common in other states detachable magazine plus pistol grip and flash hider is an assault weapon here, and possessing it is a wobbler up to 3 years. The definition is features, not firepower: the same rifle is legal or criminal depending on its furniture. If yours might not comply, convert it, sell it out of state through a dealer, or surrender it before the question gets asked at a traffic stop.

I just moved to California with my rifles what am I supposed to do?

Act within your arrival window: new residents must bring firearms into compliance and for anything meeting the assault-weapon definition, the lawful paths are conversion (featureless or fixed-magazine), sale out of state through a licensed dealer, or surrender to law enforcement; there is NO current registration option, since past windows closed. Ordinary handguns and compliant long guns have their own new-resident reporting rules. The trap to avoid: doing nothing the rifle in the moving boxes becomes a wobbler charge at the first vehicle search or storage-unit issue, and ‘I didn't know California was different' works far better as a pre-charge compliance story than a post-charge defense. An hour with a knowledgeable gun shop or counsel on arrival prevents the entire problem.

What are the penalties for assault weapon possession?

A wobbler: up to one year as a misdemeanor, or 16 months, 2, or 3 years as a felony charged per weapon, with the firearms subject to seizure and destruction, and a FELONY conviction adding the lifetime firearm ban. The statute includes a narrow first-offense leniency provision for qualifying minimal cases, and real-world outcomes track intent: good-faith configuration mistakes, inheritances, and new-resident cases resolve as misdemeanors, reduced counts, or dismissals with early defense work (configuration analysis, knowledge defenses, compliance mitigation), while cases stacked with prohibited-person status, other crimes, or trafficking indicia draw felony treatment. The charging level not the jail estimate is what deserves the fight, because the felony's collateral consequences outlast any sentence.

Isn't the assault weapons ban unconstitutional now?

It's under serious, ongoing Second Amendment challenge federal courts have ruled against the ban and been stayed, with the Ninth Circuit's en banc process and potential Supreme Court review keeping the question alive but the ban remains ENFORCEABLE while appeals proceed, and people are charged under it today. Practical translation: constitutional litigation is an argument your lawyer preserves in your case (and pending appellate outcomes can be leverage in negotiation and timing), not a reason to possess a prohibited configuration now. Track the litigation if you're an owner the landscape can genuinely change but make possession decisions based on the law as enforced this morning, not the ruling someone posted about last year.

California's assault-weapon law criminalizes a configuration which means compliance is mechanical, ignorance is a real element, and defense is often an examiner's report away. Know your rifle's legal status before the state asks, and if it's already asking, answer through counsel with the technical truth. The Bulldog Law's firearm defense team handles § 30605 and every configuration case statewide. Contact the firm online or call (888) 928-1609.