Traveling With a Suppressor: State Lines and Form 5320.20

The federal travel form people argue about does not list suppressors. The state you are driving into is the harder question.

Two questions that get mixed together

People who ask whether they can travel with a suppressor are usually asking two different things. One is a federal paperwork question: is there a form to file before crossing a state line? The other is a state-law question: is it lawful to have this item where I am going, or even to drive through? The first has a short answer. The second is where trips actually go wrong.

This page covers both as of October 2026. It is general information, not legal advice, and it relies on primary sources linked at the bottom.

The federal form: what it covers

ATF Form 5320.20 is titled "Application to Transport Interstate or to Temporarily Export Certain NFA Firearms." Its instructions say it applies to "any destructive device, machinegun, short-barreled rifle, or short-barreled shotgun," and that the registered owner must obtain written authorization from ATF before transport. The instructions describe two copies, signed in ink, sent to ATF's NFA division, with approval covering the transport period listed on the form and a new application needed if the item is not back by the stated date. The form does not mention silencers.

The legal source is 18 U.S.C. 922(a)(4), which makes it unlawful for a person other than a licensee to transport in interstate or foreign commerce "any destructive device, machinegun... short-barreled shotgun, or short-barreled rifle" except as authorized by the Attorney General. The regulation implementing it, 27 CFR 478.28, uses the same list. In both texts, silencers do not appear.

So the short federal answer, on the text of these provisions, is that a suppressor does not need Form 5320.20. A short-barreled rifle does, and ATF's October 9, 2026 guidance says individuals must still file a Form 20 before moving an SBR or SBS across state lines.

What ATF's October 2026 guidance adds

On October 9, 2026, ATF published "Update to NFA Transfer Guidance." Two points matter for travel:

1. Section 5861(j). That provision of the tax code prohibits transporting, delivering or receiving in interstate commerce a firearm that has not been registered as required. ATF's page says the Department will not enforce it for covered items (silencers, SBRs, SBSs and "any other weapons"), citing an Attorney General statement of the same date.
2. Transfers between people. ATF's page says unlicensed individuals may not transfer NFA items to residents of other states, and that dealers may generally sell only to residents of the state where they are licensed.

The page also says the guidance does not supersede state or local law, and that enforcement could change if the injunction is overturned, Congress acts or ATF withdraws the guidance. Our ruling status page was last verified before this guidance appeared and describes a narrower position on section 5861(j); the ATF page is the newer primary source. If you are carrying a suppressor that is unregistered, the practical lesson is that the federal posture is a nonenforcement policy rather than a repeal, and you should talk to counsel before relying on it across state lines.

State law is the real gate

The federal form does nothing for you if your destination does not allow the item. Broadly, states fall into groups, and these are examples rather than a complete list:

• States that prohibit civilian suppressor possession. Our buying walkthrough names California, New York, New Jersey and Illinois as examples. A federal change in tax or enforcement does not override those laws, and ATF says a minority of states prohibit most or all NFA items.
• States that tie legality to federal compliance. Some state statutes refer to compliance with the federal NFA. A law review article from October 2026 discusses North Carolina's statute, which exempts owners in compliance with the federal provisions, and notes that what compliance means is unsettled when ATF is not enforcing them.
• States that allow possession with few extra rules. Even there, local ordinances, public-land rules and hunting regulations can limit use. Whether suppressors may be used while hunting is a separate state wildlife question.

Because laws change and are applied locally, the only dependable approach is to check the law of every state you will be in, including the one you are driving through. State attorney general offices, state police websites and firearms attorneys are the right sources.

The "safe passage" statute, and why not to lean on it

18 U.S.C. 926A, part of the Firearm Owners Protection Act, says a person not otherwise prohibited may transport a firearm for any lawful purpose from a place where they may lawfully possess and carry it to another such place, if the firearm is unloaded and neither the firearm nor ammunition is readily or directly accessible from the passenger compartment. In a vehicle without a separate compartment, the statute says the firearm or ammunition must be in a locked container other than the glove compartment or console.

Two cautions follow from the text itself. The protection applies only between places where you may lawfully possess and carry the firearm, so it is of limited help if your origin or destination does not allow the item. And federal law treats a silencer as a firearm for these purposes, but how courts and state officers have applied the provision to NFA items and to trips with stops is not something a general article can settle. If your route crosses a state that prohibits suppressors, ask an attorney before you rely on this provision.

Air travel

TSA's guidance says unloaded firearms may be transported only as checked baggage in a locked hard-sided container, and that you must declare the firearm to the airline at the ticket counter. It says firearm parts such as magazines and bolts are barred from carry-on but allowed in checked bags. The TSA page does not give separate instructions for suppressors; it lists a silencer only in its definition of a firearm. Airlines can have their own rules, so contact the airline and TSA before you travel, and remember that the destination state's law applies when you land.

Practical habits, not legal requirements

These are not federal requirements for suppressors on the text we reviewed. They are simple habits many owners use:

• Keep the suppressor in a locked case, separate from the host firearm and out of reach in a vehicle.
• Know how you acquired it and keep the paperwork for that in a safe place at home. Whether to carry copies is a personal choice to discuss with an attorney.
• Plan the route by state, and note any state that bans suppressors or restricts them in other ways.
• Avoid leaving it in an unattended vehicle. The risk of theft is real, and a stolen NFA item creates problems you do not want.
• Do not hand it to a friend from another state, even to borrow, without checking the law first. ATF's page says unlicensed individuals may not transfer NFA items to residents of other states.

What would change this page

A revision to 18 U.S.C. 922(a)(4) or 27 CFR 478.28, a change in ATF's October guidance, a court decision that alters the enforcement posture, or a change to a state's law could all move the answers above. We review this page against those sources on a schedule and have set the next review for April 12, 2027. For anything specific to your trip, an attorney licensed in the relevant states is the right adviser.

Bottom line

Federal law does not list suppressors on the interstate transport form. State law is the question to answer before you pack: confirm the law of every state on your route, keep the item secured, and do not treat a federal nonenforcement policy as a state-law exemption.