Folding stocks are generally illegal in Illinois. Under the Protect Illinois Communities Act (PICA), effective January 10, 2023, a folding stock is one of the features that turns a semi-automatic firearm into a prohibited “assault weapon.” The only civilians who can lawfully keep a firearm equipped with a folding stock are those who already owned it before that date and who registered it with the Illinois State Police by January 1, 2024. Buying, selling, or newly acquiring one is a crime.
When a Folding Stock Makes a Firearm Illegal
PICA uses a feature-based test rather than banning folding stocks as standalone parts. The way it applies depends on the type of firearm.
For a semi-automatic rifle, the firearm becomes an assault weapon if it can accept a detachable magazine (or can be readily modified to do so) and has any one listed feature. The stock language is broad. It covers any stock that is “folding, telescoping, thumbhole, or detachable, or otherwise foldable or adjustable in a manner that operates to reduce the length, size, or any other dimension” of the weapon. A single folding stock on an AR-platform rifle with a detachable magazine is enough to trigger the ban.
For a semi-automatic shotgun, there is no detachable-magazine prerequisite. A folding or thumbhole stock on a semi-automatic shotgun, by itself, makes the shotgun an assault weapon. A pump-action shotgun with a folding stock falls outside PICA because the feature test only reaches semi-automatics.
For a semi-automatic pistol, “folding stock” is not specifically named. The pistol criteria instead reference a buffer tube, arm brace, or similar part protruding behind the pistol grip that is designed to allow shoulder firing. A folding stock positioned that way could fall under that category.
PICA also treats the stock itself as an “assault weapon attachment” when it is specifically designed to convert a firearm into a prohibited configuration. And a collection of parts under one person’s control that could be readily assembled into an assault weapon counts as an assault weapon on its own.
If You Owned One Before January 10, 2023
PICA did not require surrender of firearms already lawfully owned. If you possessed a qualifying firearm before January 10, 2023, you were allowed to keep it only by completing an endorsement affidavit through your Firearm Owner’s Identification (FOID) account with the Illinois State Police. The affidavit confirmed lawful pre-ban possession and recorded the make, model, caliber, and serial number. The filing deadline was January 1, 2024.
After that date, possession without a completed affidavit is unlawful. If you missed the deadline, the statute requires you to either surrender the firearm to law enforcement or transfer it to a person authorized to possess it. No publicly announced extension or grace period exists for late filers.
Where a Grandfathered Firearm Can Be Possessed
A completed affidavit does not let you carry the firearm anywhere. PICA limits possession to specific locations:
- Private property you own or directly control.
- Another person’s private property, with express permission, and only if the property is not open to the public.
- A licensed dealer or gunsmith for lawful repair or servicing.
- A licensed firing range or competition venue for practice or sport shooting.
- In transit directly to or from any of the locations above.
Carrying a grandfathered firearm on a public street, in a park, or anywhere else off that list violates the law even if the affidavit was filed on time.
Penalties
Possessing an assault weapon in violation of PICA is a Class A misdemeanor on a first offense, punishable by up to one year in jail and a fine of up to $2,500. A second or subsequent possession offense becomes a Class 3 felony, carrying two to five years in prison and a fine of up to $25,000.
Manufacturing, selling, or importing an assault weapon is a Class 3 felony on the first offense. Selling or possessing a banned assault weapon attachment, such as a folding stock designed to convert a firearm, is a Class A misdemeanor.
The Federal Short-Barreled Rifle Question
Folding stocks raise a separate federal issue. Federal law classifies a rifle with a barrel under 16 inches or an overall length under 26 inches as a short-barreled rifle (SBR), which requires ATF registration. The ATF measures overall length with the stock fully extended, not folded. A folding stock on a rifle that measures 26 inches or more unfolded does not create an SBR by itself.
If a rifle does qualify as an SBR, federal registration is still required. As of January 1, 2026, the federal tax stamp fee that previously cost $200 per NFA item dropped to $0, but you still need to file an ATF Form 1 or Form 4, submit fingerprints, pass a background check, and wait for approval before assembling the firearm. A properly registered federal SBR can still be an illegal assault weapon under Illinois law if it meets any of PICA’s criteria.
Who Is Exempt
PICA exempts active peace officers, qualified current and retired law enforcement officers under the federal Law Enforcement Officers Safety Act, members of the Armed Services or National Guard performing official duties, federal and state law enforcement agencies equipping their officers, prison wardens and jail superintendents, armed security officers at nuclear facilities regulated by the Nuclear Regulatory Commission, and licensed private security contractors carrying firearms under their credentials. Civilians without a professional exemption have no legal path to acquire a new firearm with a folding stock in Illinois.
Narrower exemptions also cover firearms sanctioned by the International Olympic Committee and USA Shooting for competition, nonresidents transporting a weapon through Illinois within 24 hours for a lawful purpose, and possession at certain designated sport shooting events.