ATF Form 6: Import Permit Process, Form 6A, and Marking Rules

To import firearms, ammunition, or other defense articles into the United States, you need an approved ATF Form 6 import permit in hand before the shipment reaches a U.S. port of entry. Federal law makes it a crime to knowingly bring firearms or ammunition into the country outside the narrow channels ATF authorizes, and Form 6 is the gate for nearly all of them.¹ The permit applies whether you’re a commercial importer bringing in thousands of units or a private citizen bringing in one rifle, though which version of the form you file, and what you have to prove, depends on who you are and why you’re importing.

What Requires a Form 6

The permit requirement is tied to the U.S. Munitions Import List at 27 CFR Part 447. It’s broader than most people expect. It covers semiautomatic and nonautomatic firearms up to .50 caliber, combat shotguns, ammunition and its components (cartridge cases, bullets, primers, powder), individual firearm barrels, and military-grade defense articles.² If the item is on the list, you need a permit.

A few narrow exemptions exist. Minor firearm components with a wholesale value of $100 or less in a single transaction don’t need a permit, provided you’re not importing barrels, cylinders, receivers, or complete breech mechanisms. Certain articles from Canada are also exempt.³

One category can’t be fixed with a Form 6 at all. Armor-piercing ammunition is barred from importation almost entirely, with exceptions only for government agencies, for export, or for ATF-authorized testing.⁴ A private importer will not get one approved.

Which Version of Form 6 You File

Form 6 comes in several versions. The right one depends on who you are.

Licensed importers. If you’re in the business of importing, you’ll use Form 6 Part I (ATF Form 5330.3A). You also need to hold a Federal Firearms License as a Type 08 (firearms) or Type 11 (munitions) importer, and separately register with ATF on Form 4587. Registration is not the same as licensing; both are required.⁵⁶

Non-licensed individuals. Private citizens also use Form 6 Part I, but the bar is higher. The firearm generally must qualify under the sporting purposes test, be a curio or relic, or be one you previously took out of the country. A non-licensee who wants to import just a firearm barrel needs a separate permit and must show the barrel is for a handgun with a recognized sporting purpose.⁷⁸

U.S. military members. Active-duty personnel bringing a personal firearm back from an overseas posting use Form 6 Part II (ATF Form 5330.3B). ATF may approve the import if you are currently outside the United States or were within the preceding 60 days, and the firearm is suited to sporting purposes and for personal use.⁹

Nonimmigrant aliens. Foreign visitors use a different form entirely, ATF Form 6NIA (5330.3D), for the temporary importation of firearms for hunting or competitive shooting. You’ll need a valid state hunting license or proof of registration for a shooting competition. An approved 6NIA is good for one year and allows multiple entries with the same firearms, but nothing brought in under it can stay permanently or be transferred to anyone in the United States.¹⁰

The Sporting Purposes Test

The single most important gatekeeping standard is whether the firearm is “particularly suitable for or readily adaptable to sporting purposes.” Federal law uses that language to exclude surplus military weapons and other firearms ATF doesn’t recognize as civilian sporting arms.⁷ ATF applies the test differently by firearm type:

Pistols must be at least 6 inches in overall length and score a minimum of 75 points on ATF Form 5330.5, which evaluates features like weight, caliber, frame construction, and safety mechanisms.
Revolvers must have a barrel of at least 3 inches, pass a hammer drop safety test, and score at least 45 points on the same form.
Rifles are judged against the criteria in ATF’s 1989 and 1998 import studies, which focus on military-style features.
Shotguns are judged against the 2012 Importability of Certain Shotguns study.¹¹

Four categories can bypass the sporting purposes requirement: firearms imported for scientific or research purposes, unserviceable firearms brought in as curios or museum pieces, firearms for government-authorized competition or training, and firearms the importer previously took out of the country.⁷

Country-of-Origin Restrictions

A firearm that satisfies every other requirement can still be blocked based on where it came from. ATF denies import permits for defense articles from countries under U.S. arms embargoes, including Afghanistan, Belarus, Cuba, Iran, Iraq, Libya, North Korea, Sudan, Syria, and Vietnam. The same denial applies to countries under U.N. arms embargoes, including Burma, China, and Somalia.¹²

Former Soviet states carry an added layer of scrutiny. Firearms located or manufactured in Russia, Ukraine, Georgia, Kazakhstan, Kyrgyzstan, Moldova, Turkmenistan, or Uzbekistan are denied unless the specific model appears on a narrow approved list of firearms manufactured before February 9, 1996. Certain calibers from those countries, particularly 7.62×25mm, are also blocked.¹² Check the list before you file.

U.S.-manufactured military articles that were originally sent abroad under a foreign assistance or military sales program cannot be brought back in under any circumstances.²

What Goes on the Application

Both Part I and Part II ask for detailed information about the items and the parties.

Applicant details: full legal name, physical address, phone number. Licensed importers add their FFL number.
Foreign source: the name and address of the seller, manufacturer, and shipper in the country of origin.
Item description: manufacturer, model, caliber or gauge, barrel length, serial number if known, and quantity. Every entry has to match the physical markings on the actual items. Mismatches between paperwork and hardware are one of the fastest ways to get a permit denied or a shipment seized.
Purpose: commercial resale, personal use, scientific research, or competition. The stated purpose has to align with a category federal law authorizes.

Supporting documents go in with the application, typically a purchase invoice and a copy of the exporting country’s export license. Licensed Type 08 and Type 11 importers must present that foreign export license to CBP at the time of release. If the exporting country doesn’t require an export license, submit a sworn statement saying so.⁶

How to Submit and How Long It Takes

You can file Form 6 electronically through ATF eForms or mail a paper application to the Firearms and Explosives Imports Branch in Martinsburg, West Virginia.¹³ The speed gap between the two is wide. ATF’s current published processing times show eForms submissions averaging around 3 days and paper applications around 11.¹⁴ Numbers fluctuate with volume, but the eForms advantage is consistent.

An approved permit is valid for 12 months from the date of approval.¹⁵ If the shipment doesn’t arrive inside that window, you’ll need a new permit. ATF returns either a signed permit or a formal denial. The permit comes back with two blank copies of ATF Form 6A, which you’ll use at customs.⁶

Clearing Customs with Form 6A

An approved Form 6 gets you past ATF. To get the shipment out of customs, you file ATF Form 6A (5330.3C). It’s the document you present to Customs and Border Protection to prove the shipment was authorized, and it also verifies that what’s being released matches what the permit approved.¹⁶

A few rules on the Form 6A catch even experienced importers:

One shipment, one Form 6A, even when several shipments share the same permit number.
Every description on the Form 6A has to match the approved Form 6 exactly. Mismatched serial numbers, calibers, or quantities will delay or block release.
Licensed importers must hand CBP a copy of the exporting country’s export license along with the Form 6A and the approved permit.⁶
You can present the Form 6A in duplicate at the port or submit the data electronically through the Partner Government Agency (PGA) message set.

After CBP releases the shipment, licensed and registered importers have 15 days to complete Section III of the Form 6A (verification of importation) and mail a copy to ATF. Any serial numbers that weren’t known when the original Form 6 was filed must be reported at this step.¹⁶ Missing that 15-day deadline is the kind of recordkeeping lapse that can trigger a compliance inspection.

Marking Requirements After Import

Licensed importers have a mandatory marking obligation once the firearms clear customs. Every imported firearm has to be permanently engraved on the frame or receiver with the importer’s name (or recognized abbreviation) and place of business, plus a unique serial number if none exists. The frame or receiver also has to show the model designation, caliber or gauge, foreign manufacturer’s name, and country of manufacture.¹⁷

The engravings must be at least .003 inches deep, with serial and license numbers printed no smaller than 1/16 of an inch, and placed to resist removal or alteration.¹⁷ Skip the marking step and the firearms can’t legally be sold or transferred in the United States.

Customs Duties

Separate from the ATF permit, imported firearms are subject to customs duties under the Harmonized Tariff Schedule. Current 2026 rates for common categories:

Revolvers and pistols: 14 cents each plus 3% of value.
Shotguns: 2.6% of value.
Rifles valued over $25 but not over $50: 3.8% of the rifle’s value, plus 10% of any telescopic sight’s value.
Rifles valued over $50: 3.1% of the rifle’s value, plus 13% of any telescopic sight’s value.¹⁸

When a rifle arrives with a telescopic sight, customs requires each component to be valued separately for duty purposes. Additional country-specific tariffs or surcharges can apply and can shift with trade policy.

Penalties for Importing Without a Permit

Bringing in an item on the Munitions Import List without a permit, failing to register as an importer when required, or making a false statement on a permit application can bring a fine of up to $1,000,000, up to 10 years in federal prison, or both.¹⁹ The penalty applies per violation.

The goods are also at risk. Any firearm, ammunition, or defense article imported in violation of federal law is subject to forfeiture, and the government takes permanent ownership once the process is complete. For Federal Firearms Licensees, the stakes go beyond the criminal case: ATF can revoke an FFL for willful violations of the Gun Control Act or its regulations.¹⁹ An importer who skips Form 6 or falsifies an application is building the record that supports revocation.

1
Office of the Law Revision Counsel. 18 USC 922
2
eCFR. 27 CFR Part 447 – Importation of Arms, Ammunition and Implements of War
3
eCFR. 27 CFR 447.41 – Permit Required
4
eCFR. 27 CFR 478.37 – Manufacture, Importation and Sale of Armor Piercing Ammunition
5
eCFR. 27 CFR 447.31 – Registration Requirement
6
Bureau of Alcohol, Tobacco, Firearms and Explosives. How To Receive Imported Firearms, Ammunition, and Implements of War
7
Office of the Law Revision Counsel. 18 USC 925
8
eCFR. 27 CFR 478.113a – Importation of Firearm Barrels by Nonlicensees
9
eCFR. 27 CFR Part 478 Subpart G – Importation
10
Bureau of Alcohol, Tobacco, Firearms and Explosives. Application/Permit for Temporary Importation of Firearms and Ammunition by Nonimmigrant Aliens (ATF Form 6NIA)
11
Bureau of Alcohol, Tobacco, Firearms and Explosives. Import Firearms, Ammunition, and Defense Articles
12
eCFR. 27 CFR 447.52 – Import Restrictions Applicable to Certain Countries
13
Bureau of Alcohol, Tobacco, Firearms and Explosives. eForms Applications
14
Bureau of Alcohol, Tobacco, Firearms and Explosives. Current Processing Times
15
Bureau of Alcohol, Tobacco, Firearms and Explosives. Application and Permit for Importation of Firearms, Ammunition and Implements of War
16
Bureau of Alcohol, Tobacco, Firearms and Explosives. Release and Receipt of Imported Firearms, Ammunition and Defense Articles (ATF Form 6A)
17
eCFR. 27 CFR 478.92 – Identification of Firearms and Armor Piercing Ammunition
18
United States International Trade Commission. Harmonized Tariff Schedule of the United States (2026) – Chapter 93
19
Bureau of Alcohol, Tobacco, Firearms and Explosives. Federal Firearms Regulations Reference Guide