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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. Until October 9, 2026 you filed a Form 1, waited for approval, and only then put the short barrel on it — assembling it first was manufacturing an unregistered NFA firearm. ATF no longer enforces the making-approval requirement, so federally that gate is gone. Florida is the open question, not the federal process — see the 790.221 note above before you cut anything. Marking requirements under § 5842(a) still apply to anything you make. Historically, assembling without approval was treated as 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 | No longer gated federally. 18 U.S.C. § 922(b)(4) bars a licensee from delivering a short-barreled rifle or shotgun to a non-licensee without the Attorney General’s authorisation, and on October 9, 2026 ATF said it will not enforce that provision while it writes regulations for licensees to make these transfers. |
That inversion is over. For most of 2026 building was the freer route, because the court had enjoined the making and registration requirements while § 922(b)(4) still stood in the way of a counter sale. ATF’s October 9 guidance removed the asymmetry: it will not enforce the registration and approval requirements, and it will not enforce § 922(b)(4) either. Both routes are open federally.
What survives on the Form 1 side is the part that was never about registration. Marking requirements under § 5842(a) still apply to anything you make — your name, city and state on the receiver, to the depth and size the regulation specifies. That has not moved, and it is the detail people miss.
Where we stand, updated October 9, 2026. On October 9, 2026 ATF published an Open Letter and FAQs saying it will no longer enforce the requirement to get ATF approval before making or transferring — or to register — suppressors, short-barreled rifles, short-barreled shotguns and “any other weapons.” ATF applies this to everyone, not only the parties to the lawsuit, and calls it enforcement discretion.
We have changed our process to match. For those four categories we now transfer on a completed ATF Form 4473 and a NICS background check. No Form 4. No tax stamp. No waiting for an approval that is no longer required.
What has not changed. Machine guns and destructive devices still carry the $200 tax and the full NFA process, with no exceptions. A Form 4473 and a NICS check are still required on every transfer — ATF’s FAQ says so in terms. You still have to be legally allowed to possess a firearm. Our own five business day wait still applies to buyers without a Florida concealed weapon license; that is our policy, not a legal requirement, and we are keeping it. And this is federal — it does not change state or local law.
If you would rather have the paperwork, ATF still accepts and approves Form 1 and Form 4 applications from anyone who wants to register voluntarily. Say so and we will file it for you.
This could change back. ATF has said that material changes in legal or factual circumstances could cause enforcement to resume — a new tax from Congress, the injunction being dissolved or overturned, or the Department rescinding the guidance. We will update this page if that happens, and we date every revision. Read ATF’s guidance and FAQs · read the Open Letter.
And then there is Florida. ATF’s guidance is federal and does not change state law — ATF says so itself. Fla. Stat. 790.221 makes possession of a short-barreled rifle or shotgun a second-degree felony, with an exception for firearms “lawfully owned and possessed under provisions of federal law.” Suppressors are not named in that statute at all.
No Florida court has decided how that exception applies to a short-barreled rifle that is lawful federally but not registered, and there is no Florida Attorney General opinion on it. We are not going to tell you how it comes out, because we do not know and we are not lawyers. Talk to a Florida attorney before you build or buy one. If you would rather hold a stamp while that question is open, ATF still accepts Form 1 and Form 4 applications and we will file one for you. More on the Florida NFA page.
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?
Assembly is making. Federally, ATF stopped enforcing the approval requirement for making an SBR on October 9, 2026, so there is no longer a stamp to wait for. The marking requirements under § 5842(a) still apply, and Florida’s 790.221 has not been tested against an unregistered SBR — talk to a Florida attorney before you assemble one in this state.
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?
Federally, no — as of October 9, 2026 ATF does not enforce the making, registration or approval requirements for SBRs. Marking requirements under § 5842(a) still apply to anything you make. Florida’s 790.221 exception has still not been tested against an unregistered SBR, so talk to a Florida attorney. We will file a Form 1 for you on request.
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 Aaron@burntofferingsdefense.com 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.