To legally own a suppressor, you register it with the Bureau of Alcohol, Tobacco, Firearms and Explosives under the National Firearms Act before you take possession. Suppressor NFA registration means filing an ATF application (Form 4 if you’re buying one, Form 1 if you’re building one), passing an FBI background check, and receiving an approved tax stamp. Recent legislation dropped the transfer tax for suppressors to $0, but every other part of the process still applies, and skipping it is a federal felony.1Office of the Law Revision Counsel. 26 USC 5811 – Transfer Tax
What the Law Treats as a Suppressor
Federal law defines a suppressor as any device that reduces the sound of a gunshot from a portable firearm. The definition also reaches any combination of parts designed for building one, and even a single component intended only for that purpose.2Legal Information Institute. 18 USC 921(a)(24) – Firearm Silencer Definition A spare baffle, an end cap, or a wipe you bought online each qualifies as a “silencer” on its own.
This matters before you register anything. If you buy the parts to assemble a suppressor and don’t have an approved tax stamp yet, the ATF can treat that as possession of an unregistered NFA firearm. The same logic applies to “solvent traps” and “fuel filter kits” marketed as easily convertible: the ATF’s position is that buying them with intent to convert requires an approved Form 1 first, and enforcement around these products has increased. Order parts after your stamp is in hand, not before.
Suppressors sit on the NFA registry alongside machine guns, short-barreled rifles, short-barreled shotguns, and destructive devices under 26 U.S.C. § 5845(a)(7).3Office of the Law Revision Counsel. 26 USC 5845 – Definitions Every one in the country must appear in the National Firearms Registration and Transfer Record.4Bureau of Alcohol, Tobacco, Firearms and Explosives. National Firearms Act An unregistered suppressor is contraband, and there is no after-the-fact way to register one.
Who Can Register a Suppressor
You have to be at least 21 to buy a suppressor from a licensed dealer. Buyers between 18 and 20 can sometimes receive one through a private Form 4 transfer, but only where state law allows it.
Federal law disqualifies several categories of people from possessing any firearm, including suppressors. Under 18 U.S.C. § 922(g), you cannot own one if you have a felony conviction, a domestic violence misdemeanor conviction, an active domestic restraining order, a dishonorable military discharge, or a history of involuntary commitment, among other prohibitions.5Office of the Law Revision Counsel. 18 USC 922 – Unlawful Acts The ATF runs an FBI background check on every applicant to verify none of these apply.6Bureau of Alcohol, Tobacco, Firearms and Explosives. Identify Prohibited Persons
State law is the other filter. Roughly 42 states allow private suppressor ownership; about eight ban it outright. An approved ATF application does not override a state-level ban, so confirm your state permits possession before you start any federal paperwork.
The Two Registration Paths
Which application you file depends on whether you’re buying a finished suppressor or making one yourself.
Buying From a Dealer: ATF Form 4
Most buyers use ATF Form 4 to register the transfer from a dealer.7Bureau of Alcohol, Tobacco, Firearms and Explosives. eForms Applications The form asks for your full legal name, Social Security number, physical address, and the suppressor’s serial number, manufacturer, model, and caliber. You also submit two FD-258 fingerprint cards and a passport-style photograph.8Bureau of Alcohol, Tobacco, Firearms and Explosives. NFA Form 1 Submission External Guidance With QA
Before submitting, you send a completed copy to the chief law enforcement officer in your area, typically the local sheriff or chief of police. This is notification only; the CLEO cannot block your application.9Bureau of Alcohol, Tobacco, Firearms and Explosives. Firearms – Frequently Asked Questions
You can submit through the ATF’s eForms portal or by mail. eForms is faster and gives you an immediate tracking number. Under no circumstances can you take possession of the suppressor, or even handle it at the dealer’s counter, until the approved stamp comes back.
Building Your Own: ATF Form 1
If you want to build a suppressor, file ATF Form 1 and wait for approval before you start manufacturing.7Bureau of Alcohol, Tobacco, Firearms and Explosives. eForms Applications The same fingerprint cards, photograph, and CLEO notification apply. You’ll describe the suppressor you plan to make, including caliber, length, and materials. Construction cannot begin until you’re approved.
Once approved, you must engrave identifying information onto the suppressor. The serial number goes on the outer tube, and your name (or trust name) and city and state go on the tube or an end cap. All markings must be at least 1/16 inch tall and .003 inches deep.10eCFR. 27 CFR 479.102 – Identification of Firearms Professional laser engraving typically runs $20 to $125.
The Tax Stamp Is Now $0
The transfer tax for suppressors used to be $200. Under the current version of 26 U.S.C. § 5811, the $200 tax now applies only to machine guns and destructive devices; suppressors, short-barreled rifles, and short-barreled shotguns transfer at $0.1Office of the Law Revision Counsel. 26 USC 5811 – Transfer Tax The application, background check, fingerprints, photo, and CLEO notification all remain. Only the fee changed.
How Long Approval Takes
The ATF publishes average processing times each month. For applications finalized in March 2026:11Bureau of Alcohol, Tobacco, Firearms and Explosives. Current Processing Times
- Form 4 (Individual), eForms: 6 days
- Form 4 (Trust), eForms: 25 days
- Form 4 (Individual), paper: 30 days
- Form 4 (Trust), paper: 20 days
- Form 1, eForms: 49 days
- Form 1, paper: 64 days
These are averages of finalized applications. Some take longer if the ATF flags something for additional research or application volume spikes. Individual eForms Form 4s are consistently the fastest route.
Individual Registration or NFA Trust
You can register the suppressor to yourself as an individual or to a legal entity called an NFA trust. The choice affects who can use the suppressor day to day.
An individual registration ties the suppressor to you alone. No one else can possess it unless you’re physically present. Your spouse cannot take it to the range without you. A friend cannot borrow it. If someone else has unsupervised access, for example by knowing the combination to your safe, they could face a constructive possession charge.
An NFA trust lets you name additional “responsible persons” who can possess and transport the suppressor independently, and beneficiaries who inherit it without a standard transfer. The cost is that every responsible person must submit their own fingerprint cards, photograph, and CLEO notification.12Bureau of Alcohol, Tobacco, Firearms and Explosives. Background Checks for Responsible Persons Adding more people can lengthen processing time because the ATF investigates each one. Attorney fees for drafting an NFA trust range from about $20 to $600.
Living With a Registered Suppressor
Registration is not a one-time interaction. The regulations in 27 CFR Part 479 impose ongoing obligations for as long as you own the item.13Bureau of Alcohol, Tobacco, Firearms and Explosives. 27 CFR Part 479 – Machine Guns, Destructive Devices, and Certain Other Firearms
Keep your approved tax stamp accessible. The ATF or any law enforcement officer can ask to see proof of registration. Many owners carry a physical or digital copy when transporting the suppressor and leave the original at home.
If the suppressor is registered to you as an individual, only you can possess it. “Possess” means having control, not just handling it. Storage in a locked container that only you can open keeps the line clean.
Interstate Travel
Suppressors are treated differently from other NFA items when it comes to crossing state lines. The federal statute restricting interstate transport, 18 U.S.C. § 922(a)(4), lists destructive devices, machine guns, short-barreled shotguns, and short-barreled rifles, but not suppressors.14Office of the Law Revision Counsel. 18 USC 922 – Unlawful Acts ATF Form 5320.20 itself confirms it applies only to those four categories.15Bureau of Alcohol, Tobacco, Firearms and Explosives. ATF Form 5320.20 – Application to Transport Interstate or to Temporarily Export Certain NFA Firearms You do not need Form 5320.20 approval to travel across state lines with a registered suppressor. The constraint is the destination: if you cross into a state that bans suppressors, possession there violates state law regardless of your federal registration. Check the laws of every state you’ll pass through.
Lost or Stolen
If your suppressor is stolen or goes missing, federal regulations require you to report it to the ATF immediately. The report must include your name and address, the serial number, manufacturer, model, and caliber, and a full description of the circumstances.16eCFR. 27 CFR 479.141 – Stolen or Lost Firearms Report to local law enforcement as well. A delay between the theft and the report becomes a problem if the item surfaces later.
Repair Is More Restricted Than You’d Think
Owning a registered suppressor does not give you the right to replace its internal parts. The ATF treats individual suppressor components as “silencers” under the statutory definition, so replacing a baffle or end cap is considered manufacturing a new silencer. Only a federally licensed manufacturer holding a special occupational tax stamp can do that work.17Bureau of Alcohol, Tobacco, Firearms and Explosives. Frequently Asked Questions – Silencers A gunsmith with a regular dealer’s license can accept the suppressor for cleaning or inspection, but fabricating replacement parts crosses into manufacturing.18Bureau of Alcohol, Tobacco, Firearms and Explosives. NFA Handbook
As the registered owner you can repair the outer tube, for example by rethreading the mount end, as long as you don’t change the caliber, significantly alter the dimensions, or obliterate the serial number. Replacing the outer tube entirely counts as making a new suppressor and requires a new approved Form 1 before the work.17Bureau of Alcohol, Tobacco, Firearms and Explosives. Frequently Asked Questions – Silencers Budget for professional repair through an SOT manufacturer and don’t source your own replacement parts.
Penalties for Getting It Wrong
Possessing an unregistered suppressor, failing to register a transfer, or making a suppressor without ATF approval are all federal felonies. Under 26 U.S.C. § 5871 the penalty is up to ten years in federal prison and a fine of up to $10,000.19Office of the Law Revision Counsel. 26 USC 5871 – Penalties General federal sentencing law can push fines up to $250,000. The penalties apply to anyone who facilitates an illegal transfer, not just the person holding the item.
Prosecutors do not have to prove you intended to commit a crime with the suppressor. Possession without proper registration is enough. The broad statutory definition compounds the risk: a spare set of baffles in your garage, bought with a vague plan to build something eventually, can trigger the same felony charge as a fully assembled unregistered suppressor. Ignorance of the registration requirement is not a workable defense.