What Is an ATF Form 1 and When Do I Need One?

What This Means for You

Making an NFA item without a prior-approved Form 1 is a federal felony, even if you planned to file paperwork afterward. This is one of the most common legal mistakes gun owners make, they buy a short upper for their AR-15 and attach it to a lower with a stock, unknowingly creating an unregistered SBR. Filing the Form 1 first makes the exact same action completely legal.

The Detail

When you need a Form 1:

- Converting an AR-15 pistol to an SBR (adding a stock to a barrel under 16 inches)
- Shortening a rifle barrel below 16 inches
- Shortening a shotgun barrel below 18 inches
- Manufacturing a suppressor (legal in most states with approved Form 1)
- Converting a shotgun to an SBS
- Adding a vertical foregrip to a pistol under 26 inches (creates AOW, technically Form 1 to make)

Form 1 vs Form 4:
- Form 1: YOU are making the NFA item from existing parts or firearms
- Form 4: you are BUYING a completed NFA item from a dealer
- Both require NFA registration. Tax stamp fee is $0 for SBRs, SBSs, suppressors, and AOWs as of January 2026 (OBBBA). Machine guns and destructive devices still $200.
- Both Form 1 and Form 4 eForms are processing in days to weeks since the OBBBA took effect in January 2026

eForm 1 filing process:
1. Create account on ATF eForms (eforms.atf.gov)
2. Complete the application:
- Maker information (you or your trust)
- Firearm details (make, model, serial number, caliber, barrel length, overall length)
- Type of NFA item being made
- Responsible person information (name, address, citizenship)
3. Upload photograph (passport-style, within last year)
4. Upload fingerprints:
- Electronic submission through approved kiosk, OR
- Mail FD-258 fingerprint cards to ATF within 10 days of submission
5. Submit via pay.gov (tax stamp fee is $0 as of January 2026)
6. Submit form electronically
7. Wait for approval (do NOT make the item until approved)
8. Once approved: make the item and engrave as required

Engraving requirements:
- Must engrave on the firearm: your name (or trust name), city, and state
- Minimum depth: 0.003 inches
- Minimum height: 1/16 inch (0.0625 inches)
- Engrave on a conspicuous location on the receiver
- Must be completed before assembling the NFA configuration
- Professional engraving costs $30 to $75

Common Form 1 mistakes:
- Making the item before approval is received (federal crime)
- Incorrect serial number on the form (causes delays or denial)
- Failing to engrave before assembling in NFA configuration
- Not notifying ATF of address changes
- Filing as individual when a trust would be more practical

Build Impact

If you are planning an SBR build, file the eForm 1 as soon as you have the lower receiver, you can buy and collect all other parts while waiting for approval. Do not attach the short upper to a stocked lower until your Form 1 is approved. Keep the upper and stocked lower physically separate until approval is in hand. Once approved, get the engraving done immediately and then assemble. Keep a copy of the approved Form 1 with the firearm at all times.