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SBRs: Form 1 vs. Form 4
Two routes to the same rifle. A Form 1 is permission to make one yourself. A Form 4 is permission to receive one somebody else already made. They cost the same now — $0 — so the choice is about what you want to end up with, and in 2026 about something rather less obvious.
What makes a rifle an SBR. A barrel under 16 inches, or an overall length under 26 inches with any folding stock extended. Either one on its own is enough. Barrel length is measured from the closed bolt face to the muzzle, and a permanently attached muzzle device counts toward it — which is how a 14.5-inch barrel with a pinned and welded flash hider stays a 16-inch rifle.
The two routes
| Form 1 — make it | Form 4 — buy it | |
|---|---|---|
| What it is | Application to make an NFA firearm | Application to transfer one to you |
| You start with | A rifle or stripped receiver you already own | Nothing — the SBR already exists |
| Tax | $0 | $0 |
| Engraving | You are the maker. Your markings go on it. | Already done by the manufacturer |
| Dealer involved | No — it is between you and ATF | Yes — it transfers through an SOT |
| Typical wait | Often shorter | Often longer — a Form 3 has to happen first |
| Resale | Your name is engraved on it, permanently | Manufacturer's markings only |
Form 1: making your own
You own the rifle or the receiver already. You file the Form 1, you wait for approval, and only then do you put the short barrel on it. Assembling it first is manufacturing an unregistered NFA firearm — the felony people commit by being impatient on a weekend.
Because you are the maker, federal marking requirements apply to you. Under 26 U.S.C. § 5842(a) the receiver must carry:
- Your name, or the full name of your trust
- Your city and state
- Marked to a depth of at least 0.003 inches
- In a print size of at least 1/16 inch
A laser engraver does this in a couple of minutes and shops charge very little for it. Do it after approval, on the receiver, somewhere you can live with looking at — it is permanent and it follows the gun forever. If you ever sell it, the buyer gets a rifle with your name on the side. Some people mind that a great deal.
Trust owners: engrave the trust's name, not yours. It is the maker. Getting this backwards means re-engraving a receiver you have already marked.
Form 4: buying one already built
A factory SBR — or a used one from another individual — comes to us on a Form 3 from the distributor or on a Form 4 from the seller, and then transfers to you on your own Form 4. Two steps, and the first one has to finish before the second can start.
You get manufacturer's markings, a rifle built as a short-barreled rifle rather than converted into one, and usually a warranty. You give up the wait being under your control, and you give up choosing the configuration.
We hold an 07 manufacturer's licence with a Class 2 SOT, which means we can also build one for you rather than only transferring one that exists. If what you want does not come from a factory, that is the third route and it is worth an email.
The 2026 wrinkle — and it is counterintuitive
On 5 August 2026, in Silencer Shop Foundation v. ATF (consolidated with Jensen v. ATF), the Northern District of Texas held the NFA's registration and approval requirements unconstitutional as applied to suppressors, SBRs and SBSs now that the tax on them is $0. The judgment took effect on 13 August 2026. It reaches the plaintiffs, the members of the organisations that sued and the customers of the companies that sued — not the public at large.
For SBRs, the two routes came apart:
| Route | Where it stands for a covered person |
|---|---|
| Form 1 — making your own | The making and registration requirements were enjoined. Marking requirements under § 5842(a) were not. |
| Form 4 — buying from a dealer | Still gated. 18 U.S.C. § 922(b)(4) separately bars a licensee from delivering a short-barreled rifle or shotgun to a non-licensee without the Attorney General's authorisation — and that is a Gun Control Act provision, which was never challenged in this case. |
So the ordinary intuition inverts. Historically, buying was the simple path and building was the project. Right now, for a covered person, building is the freer of the two and buying over a counter is not. Suppressors were never in § 922(b)(4), which is why they can move on a Form 4473 while SBRs cannot.
Read the fine print on any dealer's claim here. Some industry sources describe the ruling as lifting Form 4 requirements for SBRs as well; the more careful reading — and ours — is that § 922(b)(4) still stands in the way of a counter sale. ATF Director Robert Cekada said on 28 August 2026 that formal guidance is being written. It does not exist yet, the government's appeal window has not closed, and the court kept the power to reimpose its stay on short notice.
Where we stand: we file. ATF has not issued guidance on the August 2026 ruling, so nothing about how we do business has changed. Silencer Shop is still submitting Form 3s to us. We still file your Form 4. You still wait.
We are not going to be the shop that guessed at a federal felony on a customer's behalf. We follow the law as it is written and enforced, not as it might be after an appeal. When ATF says something different in writing, we will change what we do, and this page will say so on the day it happens.
And then there is Florida. Fla. Stat. 790.221 makes possessing a short-barreled rifle a second-degree felony except where it is lawfully owned under federal law. An unregistered SBR in this state leans entirely on that exception, which no Florida court has yet tested. A suppressor carries none of that exposure because 790.221 does not mention suppressors. The full argument is on the Florida NFA page — read it before you build anything.
Which route makes sense
| If you... | Route |
|---|---|
| Already own the rifle or receiver you want to shorten | Form 1 |
| Want a specific barrel length, handguard and brace or stock combination | Form 1 |
| Want the shortest realistic wait | Form 1 |
| Care about resale value and clean markings | Form 4 |
| Want a factory-built gun with a warranty | Form 4 |
| Do not want to own the tools or deal with engraving | Form 4 |
| Want something no factory makes | Talk to us — we are an 07 and can build it |
The traps
- Assembling before approval. The short barrel and the receiver must not meet until the form comes back. Owning both parts is fine; putting them together is making an unregistered NFA firearm.
- Constructive possession. A registered SBR upper and a second, unregistered lower in the same safe is a question you do not want to have to answer. Keep the picture clean.
- Overall length under 26 inches. People measure the barrel and forget the other test. A 16-inch barrel on a very short receiver extension can still be an SBR.
- Crossing a state line. 18 U.S.C. § 922(a)(4) requires ATF authorisation to move an SBR or SBS interstate. Still in force, not part of the 2026 case, and the single most commonly broken NFA rule. Get the approval before the trip.
- Engraving the wrong name. The maker is whoever the application says it is. Trust name if it is a trust.
- Assuming a brace changes the maths. The rules on braced pistols have been through several rounds of rulemaking and litigation. A pistol is not an SBR, but this is a subject where the ground has moved repeatedly — do not build to last year's understanding of it.
What it costs
| Line | Form 1 | Form 4 |
|---|---|---|
| ATF tax | $0 | $0 |
| The rifle or receiver | You already own it | Varies |
| Short barrel / upper | Varies | Included |
| Engraving | Small one-off cost | None — already marked |
| Fingerprints & photo | Required | Required |
| Dealer transfer | None — no dealer involved | Ours is on the transfers page |
Common questions
Can I put the short upper on before approval if I do not shoot it?
No. Assembly is making. It does not matter whether you fire it, and it does not matter that you could take it apart again in ten seconds. Wait for the stamp.
Can I sell a Form 1 SBR later?
Yes, on a Form 4 to the buyer, with a $0 tax now. Your name and city stay engraved on it permanently, which is a real consideration if you buy and sell often.
Can I put a 16-inch upper back on an SBR lower?
Yes. A registered SBR lower can wear a longer upper any time. The registration is on the receiver, and going the safe direction is never a problem.
Does an SBR still need a Form 1 if I am covered by the 2026 ruling?
For a covered person, the court enjoined the making and registration requirements — so federally, no. Marking requirements still apply, interstate transport still needs authorisation, and Florida's 790.221 exception has not been tested against an unregistered SBR. We would still file today, and we will tell you plainly if that changes.
Should I do a suppressor or an SBR first?
Suppressor, almost always. It improves every rifle you own rather than one, it carries none of the interstate transport problem, and in Florida it carries none of the state-law exposure. See how to buy a suppressor.
Can you build one for me?
Yes. We hold an 07 manufacturer's licence with a Class 2 SOT, so we can make it rather than just transfer it. Email us what you have in mind and we will tell you whether it is sensible, and when it is not.
Not sure which way to go? Email [email protected] with the rifle you already own and what you want it to become. Half the time the answer is that you do not need to make it an SBR at all. Appointments only, no walk-ins.
General information from a licensed dealer, not legal advice. Federal, state and local law changes — and in 2026 it is changing faster than usual. Confirm the rules in your own jurisdiction, and confirm the current status of any court order, before you buy. Last reviewed 3 September 2026.