Question: Do I need ATF approval before delivering or shipping an NFA firearm to a gunsmith for repair, refinishing, customization, evaluation, or other gunsmithing work?
Short answer: A Form 5 generally is not required, although ATF recommends it as an optional way to document the temporary conveyance. A Form 20 may be required if the NFA firearm will cross state lines. The answer depends primarily upon the type of NFA firearm involved.
Is a Form 5 required?
Ordinarily, no.
Federal regulations do not treat the temporary conveyance of a lawfully possessed NFA firearm to a qualified manufacturer or dealer as an NFA “transfer” when the firearm is delivered solely for:
- Repair;
- Identification;
- Evaluation;
- Research;
- Testing;
- Calibration; or
- Similar gunsmithing work followed by return to the same lawful possessor.
See 27 C.F.R. § 479.11.
Because the transaction is not considered a transfer, the owner ordinarily does not need to transfer the firearm to the gunsmith on a Form 4 or Form 5. Likewise, the gunsmith ordinarily may return the same repaired firearm directly to the person from whom it was received without a new Form 4, Form 4473, or NICS background check. See 27 C.F.R. § 478.124(a).
This rule is not limited to factory warranty repairs. It can apply when an NFA firearm is temporarily delivered to the original manufacturer, an independent gunsmith, a refinisher, or another properly licensed business for covered work, provided the firearm will be returned to the same lawful possessor.
Why does ATF recommend using a Form 5?
Although a Form 5 is not ordinarily required, ATF has historically recommended using one to document that the gunsmith’s possession is temporary and solely for repair or similar work.
If the parties elect to use the Form 5 procedure, the registered owner submits a Form 5 and waits for approval before delivering the firearm. The gunsmith then submits another Form 5 and receives approval before returning it.
In many cases, the parties instead document the arrangement through a detailed repair order, RMA, or similar business record. ATF’s NFA Handbook recommends that such documentation identify:
- The registered owner;
- The receiving gunsmith or manufacturer;
- The firearm’s manufacturer, model, caliber, type, and serial number;
- The specific work to be performed;
- The date the firearm was delivered or shipped;
- The anticipated repair period; and
- The fact that the same firearm will be returned to the same lawful possessor.
The owner should also retain the shipping records, repair correspondence, and a copy of the firearm’s registration document. The gunsmith must make any required entries in the business’s acquisition-and-disposition records. ATF generally requires a firearm retained from one business day to another to be recorded in the gunsmith’s A&D records.
Is a Form 20 required if the gunsmith is in another state?
For some NFA firearms, yes.
A nonlicensee must obtain an approved ATF Form 5320.20 before transporting or shipping the following firearms across state lines:
| NFA firearm | Form 20 required for interstate gunsmithing shipment? |
|---|---|
| Short-barreled rifle | Yes |
| Short-barreled shotgun | Yes |
| Machine gun | Yes |
| Destructive device | Yes |
| Suppressor or silencer | No |
| Any Other Weapon (AOW) | No |
The interstate-transportation requirement appears in 18 U.S.C. § 922(a)(4) and 27 C.F.R. § 478.28.
Shipping the firearm by UPS, FedEx, or another common carrier does not avoid the Form 20 requirement. The regulation expressly contemplates transportation by common or contract carrier.
For a temporary gunsmithing shipment, the Form 20 should identify the gunsmith’s licensed premises as the destination, explain that the purpose is repair or gunsmithing, identify the method of transportation, and provide a date range covering both the outbound shipment and anticipated return. If the firearm cannot be returned within the approved period, the owner should obtain additional authorization before the return shipment.
The fact that the receiving gunsmith holds an FFL or SOT does not eliminate the registered nonlicensee’s obligation to obtain a Form 20 for an interstate shipment of an SBR, SBS, machine gun, or destructive device.
A Form 20 is not federally required for the temporary interstate transportation of a suppressor or AOW. State and local law at the destination must still permit possession of the item.
Must the gunsmith have an FFL?
Yes, if the person is engaged in gunsmithing as a business.
Federal law treats a person who regularly repairs, customizes, refinishes, engraves, or fits barrels, stocks, or trigger mechanisms for livelihood and profit as a firearms dealer or gunsmith. That person must hold an appropriate federal firearms license. See 18 U.S.C. § 921(a)(11) and (21), and ATF’s Federal Firearms License information.
For ordinary work on a customer-owned NFA firearm other than a destructive device, a Type 01 dealer/gunsmith FFL is generally sufficient. ATF has stated that a licensed gunsmith repairing or modifying a customer’s personal NFA firearm for return to that customer does not ordinarily need a manufacturer’s FFL or a Special Occupational Tax stamp merely because the firearm is regulated under the NFA.
A Type 03 collector’s license is not a gunsmithing license. Destructive devices require the appropriate destructive-device license.
The analysis changes if the work crosses the line from repairing or customizing an existing firearm into manufacturing a new firearm. A manufacturer’s FFL and the appropriate NFA qualification may be required when the work involves, for example:
- Creating a new NFA firearm;
- Completing a firearm for sale or distribution;
- Replacing the registered receiver or other serialized NFA component;
- Manufacturing a new suppressor tube or other regulated silencer component; or
- Performing work as part of another company’s manufacturing process.
The distinction often turns on the purpose and scope of the work, not merely the physical operations performed.
What if the serialized component must be replaced?
The repair exception applies to the temporary conveyance and return of the same lawfully possessed firearm. If the registered receiver, suppressor tube, or other serialized NFA firearm must be replaced, the replacement may constitute a newly manufactured NFA firearm.
A new NFA firearm generally cannot simply be returned under the original registration. Additional manufacturing, registration, and transfer procedures may be required. The owner and repair facility should resolve that issue before authorizing destruction or replacement of the serialized component.
Practical checklist
Before leaving or shipping an NFA firearm for gunsmithing:
- Confirm that the recipient holds the appropriate FFL.
- Confirm whether the gunsmith will accept the particular type of NFA firearm.
- Determine whether the work is genuinely repair or customization rather than manufacturing.
- Obtain an approved Form 20 before interstate movement of an SBR, SBS, machine gun, or destructive device.
- Decide whether to use the optional Form 5 procedure.
- If no Form 5 is used, prepare and retain a detailed repair order or RMA.
- Include a copy of the registration document if requested by the gunsmith.
- Follow the gunsmith’s and carrier’s shipping instructions.
- Confirm that possession is lawful under the laws of the destination state and locality.
- Make sure the firearm will be returned to the same registered owner or lawful possessor.
Bottom line: A Form 5 is ordinarily optional for legitimate gunsmithing because temporary possession for repair and return is not treated as an NFA transfer. A Form 20, however, is presently required before a nonlicensee sends or transports an SBR, SBS, machine gun, or destructive device across state lines. Suppressors and AOWs are not subject to the Form 20 requirement.
This article addresses federally registered NFA firearms and federal law as of September 2026. State law, carrier policies, the scope of the proposed work, and the licensing status of the gunsmith may produce a different result in a particular case.
