NFA Transfer Process

1. Overview

Every NFA item transfer — whether it's a suppressor, SBR, SBS, or AOW — requires ATF approval before the item changes hands. This is fundamentally different from a standard firearm purchase. You cannot hand someone a suppressor and have them “do the paperwork later.” The Form 4 must be submitted, processed, and approved first. Transferring an NFA item without an approved Form 4 is a federal felony under 26 U.S.C. § 5861.

The good news: the process is well-defined, eForms has made it significantly faster, and the $0 tax stamp (effective January 1, 2026) removed the financial penalty that used to make private party transfers impractical. For a same-state transfer, if you can fill out a form and wait 10-15 days (individual) to 25-30 days (trust), you can transfer an NFA item.

2. Form 4 (ATF 5320.4) Explained

ATF Form 4 — officially “Application for Tax Paid Transfer and Registration of Firearm” — is the document that authorizes the transfer of an NFA item from one party to another. Despite the name referencing “tax paid,” the tax is currently $0 for suppressors, SBRs, SBSs, and AOWs.

The form captures information about both parties and the item being transferred:

StampSwap's Form 4 Guide explains what each of these fields means. When you have an active transaction, the Form 4 prep tool in your dashboard walks you through every field and keeps your personal info — like your SSN and date of birth — on your device.

3. Individual vs. Trust Registration

The buyer (transferee) chooses how to register the NFA item: as an individual or to a trust/legal entity. Each has trade-offs.

If you're buying a single item for personal use and don't need anyone else to access it, individual registration is faster and simpler. If you want your spouse, children, or shooting partners to legally possess the item without you present, a trust is the better choice.

4. Required Documents

Whether filing as an individual or trust, the buyer needs to prepare the following before submitting the Form 4:

5. eForms vs. Paper Filing

The ATF offers two ways to submit a Form 4: electronically through eForms or on paper by mail. There is no good reason to file on paper in 2026.

eForms approval times have improved dramatically since the system launched. Unless you have a specific reason that prevents electronic filing, always use eForms.

6. In-State Direct Transfer

When buyer and seller are residents of the same state, the transfer can happen directly between them without involving an FFL. Here's the process:

1. 1.Buyer and seller agree on terms (price, payment method, timeline).
2. 2.Seller provides the item's details (manufacturer, model, serial number, caliber, barrel length, overall length) to the buyer for the Form 4.
3. 3.Seller (the transferor) starts the eForm 4 at eforms.atf.gov, entering the buyer's information as the transferee. The buyer then receives an email from eForms to electronically certify and sign, and supplies their own fingerprints and passport photo. The buyer does not file their own separate Form 4.
4. 4.Buyer sends CLEO notification and submits fingerprints/photo.
5. 5.Wait for ATF approval (~10-15 days for individuals, 25-30 days for trusts).
6. 6.Once approved, seller physically transfers the item to the buyer. Seller retains a copy of the approved Form 4 for their records.

The seller retains physical possession of the NFA item throughout the entire process. Do not hand it over before receiving confirmation of Form 4 approval.

7. Interstate Transfer Through FFL/SOT

When buyer and seller are in different states, a private seller may never ship the NFA item across state lines themselves. The item has to move dealer-to-dealer, and — the invariant that governs the whole process — an NFA item never moves until the ATF form covering that movement is approved. That means the interstate path involves two Form 4s and one Form 3, in this order:

1. 1.Seller files a Form 4 to a dealer. The seller (transferor) files an eForm 4 transferring the item to a licensed FFL/SOT — typically one in the seller's own state. The seller keeps possession until this Form 4 is approved. Confirm the dealer's transfer fee upfront (typically $50-$150).
2. 2.Item goes to the dealer. Once that first Form 4 is approved, the seller delivers the item to the dealer, who logs it into their A&D book — the dealer's Acquisition & Disposition record, the bound ledger every FFL keeps of items received and released.
3. 3.Dealer-to-dealer on a Form 3. The seller's dealer moves the item to a dealer in the buyer's state on a tax-exempt Form 3. Dealers handle interstate carriage of NFA items — the private seller never ships across state lines. Form 3 approval runs same-day to a few business days.
4. 4.Buyer's dealer files the final Form 4. Once the item arrives, the buyer's dealer (now the transferor) initiates the final eForm 4 to the buyer. The buyer certifies and signs electronically and provides fingerprints, a passport photo, and CLEO notification.
5. 5.Wait for ATF approval (~10-15 days for individuals, 25-30 days for trusts).
6. 6.Once approved, the buyer's dealer releases the item to the buyer after completing a 4473 at pickup.

Interstate transfers take longer and cost more than in-state ones because the item passes through two dealers. Budget for two Form 4 waits plus a Form 3 (roughly 10-15 days each for the two Form 4s and same-day to a few business days for the Form 3, back to back), and for two dealer transfer fees ($50-$150 each) plus shipping between the dealers. As a private seller you do not need to worry about the shipping mechanics — your dealer handles the interstate carriage. (Our Shipping Guide is written for the licensed dealers who move these items, not for private parties.)

8. Common Mistakes to Avoid