A Benelli M4 is legal to own in California, but only in the fixed-stock civilian configuration sold through California dealers. The standard military and law-enforcement M4, with its collapsible stock and pistol grip, meets the state’s definition of a prohibited assault weapon and cannot be bought, sold, or possessed by civilians here. Buy the right version through a licensed dealer, clear the paperwork, and you’re fine. Modify it the wrong way afterward and you’ve committed a felony.
Which Benelli M4 Is Legal in California
California treats a semi-automatic shotgun as an assault weapon when it has both a folding or telescoping stock and a pistol grip that protrudes conspicuously beneath the action (a thumbhole stock or vertical foregrip also counts).1California Legislative Information. California Penal Code 30515 – Assault Weapon One feature alone is fine. Two together is prohibited. The military M4 has both, which is why that version is off the table.
The civilian-legal M4 solves this by shipping with a fixed-length stock. Some versions use a traditional field stock with no pistol grip. Others use a fixed pistol-grip stock that cannot telescope or fold.2State of California – Department of Justice – Office of the Attorney General. Assault Weapons Laws Either approach removes one leg of the two-feature test. If you buy an M4 from a California dealer, it will already be in a compliant configuration. The risk is almost entirely on the modification side, not the purchase side.
Factory magazine capacity isn’t a problem either. The M4 comes with a five-round or seven-round tube depending on model, both well under California’s 10-round ceiling for any ammunition feeding device.
Modifications That Turn a Legal M4 Into an Illegal One
This is where owners get into trouble. Collapsible stocks for the M4 are sold freely across most of the country, and online parts retailers don’t always flag California restrictions. Bolting a collapsible or folding stock onto a California M4 that already has a pistol grip instantly creates a prohibited assault weapon. Buying a military-configuration M4 out of state and bringing it home does the same thing. The parts being legal somewhere else doesn’t matter.
Magazine tube extensions are a second trap. Aftermarket extensions that bring capacity to eight or nine rounds remain within the 10-round limit. Anything that pushes capacity above 10 is illegal to possess in California.
There’s also a federal layer. Because the M4 is imported from Italy, it falls under 18 U.S.C. ยง 922(r), which bars assembling a non-sporting semi-automatic shotgun from more than 10 imported parts drawn from a regulated list. Extending the magazine tube or swapping the stock on an M4 typically means you need to replace enough imported components (magazine tube body, follower, trigger group pieces, stock) with American-made equivalents to keep the imported-parts count at 10 or fewer. Several aftermarket makers sell 922(r) compliance kits specifically for the M4. If you’re modifying beyond factory sporting configuration, this rule applies on top of California’s.
Who Can Buy One
You must be at least 21 to buy a semi-automatic long gun like the M4 from a California dealer. Narrow exceptions exist for active-duty military and licensed hunters, but the default is 21, and that’s stricter than the federal floor of 18. You also can’t fall into any prohibited category: felony convictions, certain violent misdemeanors, active restraining orders, involuntary mental health holds, and other disqualifiers all block the sale. The Department of Justice checks these during the background process.
What to Bring to the Dealer
- A current, non-expired California driver’s license or state ID. Military ID works if accompanied by permanent duty station orders showing a California posting.3State of California – Department of Justice – Office of the Attorney General. Frequently Asked Questions
- Proof of lawful presence if your ID shows “Federal Limits Apply.” A valid passport or permanent resident card will do.
- Proof of residency showing your current address, such as a utility bill (dated within the last three months), residential lease, or property deed.
- A valid Firearm Safety Certificate.
The Firearm Safety Certificate
Nearly every buyer needs an FSC before a dealer can process the sale. You get it by passing a short written test administered by DOJ-certified instructors, most of whom work at firearms dealers themselves.4State of California – Department of Justice – Office of the Attorney General. Firearm Safety Certificate Program FAQs The test fee is $25, and the certificate stays valid for five years. You can take it the same day you start your purchase. A free study guide is available from the California DOJ.5Office of the Attorney General – California Department of Justice. Firearm Safety Certificate Study Guide Narrow exemptions apply to active peace officers, military members, and licensed hunters buying hunting firearms.
The 10-Day Wait and Pickup
Once the dealer submits your paperwork through the Dealer’s Record of Sale (DROS) system, a mandatory 10-day waiting period starts. No firearm can be delivered within 10 days of the application, with no exceptions for prior gun owners or anyone else in the general public.6California Legislative Information. California Penal Code 26815 – Delivery of Firearm During those 10 days the DOJ runs the background check across state and federal databases.7California Legislative Information. California Penal Code 28220 – Submission of Fees and Firearm Purchaser Information to the Department of Justice The total DROS fee is $37.19.8California Department of Justice. Department of Justice Fees
You generally have 30 days from the DROS initiation to pick up the shotgun. Miss the window and the transaction expires; you start over and pay the DROS fee again.
At pickup you’ll perform a safe handling demonstration with the actual firearm, witnessed by a certified instructor or the dealer. For the M4 that means safely loading, unloading, and operating the action. If you can’t pass, you don’t leave with the gun that day.
Penalties If You Get the Configuration Wrong
Possessing an assault weapon in California is punishable by up to one year in county jail or by a term in state prison.9California Legislative Information. California Penal Code 30605 The offense is a wobbler, meaning prosecutors can charge it as either a misdemeanor or a felony. Assembling an assault weapon by adding a collapsible stock to a pistol-grip M4 falls on the harsher end of that range. Not knowing the rule won’t save you.
Don’t Buy for Someone Else
If a friend or family member wants an M4, they have to go through the process themselves. A straw purchase, where you buy a firearm for someone who can’t pass the check or wants to skip it, is a federal felony carrying up to 15 years in prison and a $250,000 fine, rising to 25 years if the gun is later used in a violent crime, terrorism, or drug trafficking.10Bureau of Alcohol, Tobacco, Firearms and Explosives. Don’t Lie for the Other Guy The ATF Form 4473 you sign at the dealer asks directly whether you are the actual buyer. Lying on it is a separate federal crime.