In California, a shotgun’s barrel must be at least 18 inches long and the firearm must measure at least 26 inches overall. Miss either minimum and the gun is a “short-barreled shotgun” under Penal Code section 17180, a generally prohibited weapon that can be charged as a misdemeanor or a felony.1California Legislative Information. California Penal Code 17180 Both thresholds apply independently, and California’s definition reaches some firearms that are perfectly legal under federal law.
The Two Minimums
The barrel floor is 18 inches, measured from the closed bolt or breech face to the far end of the barrel or any permanently attached muzzle device.2Legal Information Institute. Cal. Code Regs. Tit. 11, 5506 – Definition of Key Terms That figure matches the federal standard under the National Firearms Act, so state and federal law agree on the number.
Only permanently attached devices count toward barrel length. Permanent attachment means full-fusion gas or electric steel-seam welding, high-temperature silver soldering at 1,100°F or above, or blind pinning with the pin head welded over.2Legal Information Institute. Cal. Code Regs. Tit. 11, 5506 – Definition of Key Terms A choke, flash hider, or muzzle brake you can unscrew by hand does not extend the barrel in the eyes of the law. Thread a two-inch brake onto a 16.5-inch barrel and you still have a 16.5-inch barrel.
The overall length rule is separate. The gun must measure at least 26 inches from the rearmost point of the stock to the muzzle (or the end of a permanent muzzle device).1California Legislative Information. California Penal Code 17180 Folding or telescoping stocks are measured fully extended.2Legal Information Institute. Cal. Code Regs. Tit. 11, 5506 – Definition of Key Terms A shotgun that dips below 26 inches when the stock is collapsed is fine so long as it clears the minimum when extended. Both rules must be satisfied at the same time; a 19-inch-barreled shotgun that comes in at 25 inches overall is still prohibited.
How to Measure Correctly
Barrel length is measured from the inside, not the outside. Close the action, drop a wooden dowel down the bore until it rests against the bolt or breech face, mark the dowel where it meets the muzzle (or the end of a permanent muzzle device), pull it out, and measure to the mark.2Legal Information Institute. Cal. Code Regs. Tit. 11, 5506 – Definition of Key Terms External measurements are unreliable because of ribs and contours.
For overall length, extend any folding or collapsible stock, then measure the straight-line distance from the back of the stock to the muzzle. If your shotgun sits anywhere near the minimums, measure twice with a steel tape or calibrated rod. A quarter-inch of uncertainty is not a margin worth living with when the line between legal and felony is exactly 18 or 26 inches.
What California Counts as a Short-Barreled Shotgun
Penal Code section 17180 sweeps in five categories:1California Legislative Information. California Penal Code 17180
- Any firearm designed to fire a fixed shotgun shell with a barrel under 18 inches.
- Any firearm designed to fire a fixed shotgun shell with an overall length under 26 inches.
- Any weapon made from a shotgun by alteration or modification that results in a barrel under 18 inches or an overall length under 26 inches.
- Any device that can be quickly restored to fire a fixed shotgun shell and would then meet one of the descriptions above.
- Any part or combination of parts designed and intended to convert a firearm into a short-barreled shotgun, if those parts are in the same person’s possession or control.
The last category is the one gun owners miss. Owning a standard shotgun alongside a separately purchased 14-inch barrel can be treated as possession of a short-barreled shotgun even if the two are never assembled. The statute does not require the gun to actually be in the prohibited configuration; having the parts and the ability to combine them is enough.
The Federal Pistol-Grip Loophole Does Not Apply Here
Under federal law, a firearm must be “designed to be fired from the shoulder” to qualify as a shotgun. That is why guns like the Mossberg Shockwave, which ships with a pistol grip and no stock, escape the federal short-barreled shotgun classification even with a 14-inch barrel. California drops the shoulder-firing requirement. Section 17180 covers any firearm “designed or redesigned to fire a fixed shotgun shell” below the length minimums.1California Legislative Information. California Penal Code 17180 A 14-inch-barreled pistol-grip shotgun that is legal federally is a prohibited short-barreled shotgun in California. The 18.5-inch versions of these guns are sold in the state specifically to clear the barrel-length minimum.
California Penalties
Short-barreled shotguns appear on California’s generally prohibited weapons list under Penal Code section 16590.3California Legislative Information. California Penal Code 16590 Manufacturing, importing, selling, giving, lending, or possessing one is a crime under Penal Code section 33215.4California Legislative Information. California Penal Code 33215
The offense is a wobbler. As a misdemeanor, it carries up to one year in county jail. As a felony, the sentence under Penal Code section 1170(h) is 16 months, two years, or three years in county jail. A felony conviction also strips your right to possess any firearm in California and leaves a permanent record. Prior convictions, possession alongside other illegal weapons, or evidence that a legal shotgun was cut down to create the prohibited configuration all push prosecutors toward the felony filing.
Federal Charges Can Stack
A short-barreled shotgun that is not registered under the National Firearms Act is also a federal crime. Conviction under 26 U.S.C. § 5871 carries up to 10 years in federal prison and a fine of up to $250,000.5Office of the Law Revision Counsel. 26 USC 5871 Federal law also bars transporting a short-barreled shotgun across state lines without prior written ATF approval on Form 5320.20.6Bureau of Alcohol, Tobacco, Firearms and Explosives. Application to Transport Interstate or to Temporarily Export Certain National Firearms Act Firearms Federal charges on top of state charges are not automatic, but they can be stacked, particularly when other federal offenses are involved or when the conduct crosses state lines.
Who Can Legally Possess One
Penal Code section 33210 bars everyone from possessing a short-barreled shotgun unless a statutory exception applies.7California Legislative Information. California Penal Code 33210 The exceptions are narrow. Police departments, sheriff’s offices, the California Highway Patrol, the Department of Justice, and the Department of Corrections and Rehabilitation may purchase and possess them for official use. Individual peace officers may possess one while on duty when their agency authorizes it and the officer has completed a POST-certified training course. Those are the exemptions under Penal Code section 33220.8California Legislative Information. California Penal Code 33220
Penal Code section 33225 also allows the California Department of Justice to issue a dangerous weapons permit for “good cause” if possession will not endanger public safety. Permits run one year and may be renewed, but they are rarely granted to private citizens. Military personnel acting in an official capacity and licensed antique dealers with valid federal firearms licenses may also qualify, and all exempt persons must register the firearm with the DOJ and comply with both state and federal law. For the average gun owner, there is no realistic civilian pathway to legally possess a short-barreled shotgun in California. Completing NFA registration at the federal level does not override the state prohibition.
If You Already Have a Non-Compliant Shotgun
Inheriting, finding, or otherwise coming into possession of a shotgun that falls below either minimum means you are holding a prohibited weapon, and not knowing the measurements is not a defense. Safer options include contacting a licensed firearms dealer about surrender, arranging a voluntary turn-in through your local law enforcement agency, or consulting a firearms attorney before taking any action. Do not try to lengthen the barrel yourself; the work would need to meet permanent attachment standards, and any interim possession of the prohibited configuration can still be charged.