Building your own SBR (short barreled rifle) is straightforward with ATF Form 1. This guide covers everything from planning your build to legally completing your SBR after approval.
In This Guide
What is an SBR?
An SBR (Short Barreled Rifle) is a rifle with:
- Barrel length less than 16 inches, OR
- Overall length less than 26 inches
Common examples:
- AR-15 with 10.5" barrel and stock
- AK with short barrel and stock
- MP5 clone with stock
- PS90 with short barrel
Legal Requirements
Check Your State
SBRs are legal in most states but prohibited in some:
- Prohibited: CA, CT, HI, NJ, NY, RI, WA, DC
- Legal with restrictions: Some states have additional requirements
Federal Requirements
- File ATF Form 1 BEFORE building
- Pay tax stamp ($0 in 2026)
- Wait for approval
- Engrave before building
Critical: You cannot assemble an SBR before Form 1 approval. Having a rifle receiver + short barrel + stock in your possession before approval could be constructive possession of an illegal SBR.
Planning Your Build
Starting Points
Option 1: Convert Existing Pistol (Most Common)
Start with an AR pistol with brace, file Form 1, then add stock after approval.
- Pistol already has short barrel
- Just need to swap brace for stock
- Already have serialized receiver
Option 2: Convert Existing Rifle
Start with a rifle, file Form 1, then install short barrel after approval.
- Cut down existing barrel, OR
- Install new short barrel upper
Option 3: Build from Receiver
Start with stripped receiver, file Form 1, then build complete SBR.
- Most flexibility
- Receiver serial number goes on Form 1
What to Decide Before Filing
- Barrel length - Required on Form 1
- Overall length - Required on Form 1
- Caliber - Required on Form 1
- Make/Model - Of the receiver
- Serial number - From receiver
Filing ATF Form 1
What You Need
- ATF eForms account
- Receiver information (make, model, serial)
- Build specifications (barrel length, OAL, caliber)
- Passport-style photo
- Fingerprints in EFT format
- CLEO information
Form 1 Process
- Log into ATF eForms
- Select "Form 1 - Application to Make"
- Choose "Individual" or "Trust"
- Fill in applicant information
- Enter firearm details
- Upload photo and EFT fingerprints
- Enter CLEO information
- Review and certify
- Submit and pay tax
Wait Time
- eForms: 30-60 days typical
- Paper: 6-12 months (don't do this)
Engraving Requirements
After approval and BEFORE building, you must engrave the receiver.
Required Markings
- Your name (or trust name)
- City
- State
Technical Requirements
- Minimum depth: 0.003 inches
- Minimum character height: 1/16 inch
- On the receiver (frame)
- Conspicuous location
Common Locations
- AR-15: Magazine well, lower side
- AK: Receiver flat
- Inside of magwell (less visible but legal)
Getting It Done
- Local engraver ($30-75)
- Gun store with engraving service
- DIY with proper equipment
Building After Approval
Once you have:
- ✓ Approved Form 1
- ✓ Engraved receiver
You can legally assemble your SBR:
- Install short barrel (or upper with short barrel)
- Install stock
- Your rifle is now a registered SBR
Traveling with Your SBR
- Within your state: No notification required
- Interstate: File ATF Form 5320.20 (free, approved in days)
- Keep approved Form 1 with the firearm
Cost Breakdown
| Item | Cost |
|---|---|
| Tax Stamp (2026) | $0 |
| Fingerprinting | $0 - $30 |
| EFT Conversion | $10 |
| Engraving | $30 - $75 |
| Short Barrel/Upper | $150 - $500+ |
| Stock | $30 - $200 |
| Total | $220 - $815+ |
If converting an existing pistol, you might only need a stock ($30-200) plus paperwork costs.
