This post explains a question that comes up often after recent pistol brace litigation. It’s for general informational purposes only and isn’t legal advice — if you’re planning a build, consult a firearms attorney or NFA specialist before you touch a barrel or receiver.
Q: After Mock v. Garland and the other Texas federal court rulings, can I put an stock on a firearm with a barrel under 16 inches without an approved Form 1 tax stamp?
A: No. Even after Mock v. Garland and the subsequent federal court decisions, attaching a real buttstock to a lower receiver paired with a barrel under 16 inches without an approved NFA tax stamp remains a federal felony. This is true nationwide.
Q: What’s the difference between what’s legal and what isn’t?
A: It comes down to the type of accessory you attach:
- Actual stock + sub-16″ barrel: This creates a Short-Barreled Rifle (SBR) under the National Firearms Act (NFA). Doing this without an approved tax stamp is a federal violation, no matter what state you’re in.
- Pistol brace + sub-16″ barrel: The Texas court rulings vacated the ATF’s 2023 Pistol Brace Rule. That means attaching a pistol stabilizing brace (like an SB Tactical brace) to a sub-16″ barrel is permitted without a tax stamp. The ruling did not touch the NFA’s restrictions on actual shoulder stocks.
Q: Does Mock v. Garland apply to stocks at all?
A: No. Mock v. Garland dealt exclusively with pistol stabilizing braces, and not traditional rifle stocks. It has no bearing on stock-equipped builds.
Q: Why doesn’t the ruling extend to stocks? Here are three reasons.
- Different statutory definitions
The NFA (1934) defines a rifle as a weapon “designed or redesigned, made or remade, and intended to be fired from the shoulder.”
- A firearm with a buttstock is explicitly built to be shouldered.
- Pair that with a barrel under 16 inches, and statutory law classifies it as an SBR.
- Mock v. Garland never challenged or rewrote that statutory definition – it only challenged the ATF’s administrative interpretation of braces.
- The lawsuit was about agency process, not the underlying law
In Mock v. Garland, the Fifth Circuit and the Texas federal court found that the ATF violated the Administrative Procedure Act (APA) when it issued the 2023 Pistol Brace Rule, which had tried to treat braces as if they were stocks.
- What the court struck down: the ATF rule that went in effect in 2023 reclassifying braced pistols as SBRs.
- What the court left alone: the underlying federal law requiring a tax stamp for a short barrel paired with an actual stock.
- Braces and stocks are legally distinct
- Pistol braces were originally designed to attach a firearm to a shooter’s forearm. The Mock decision restored the status quo – an accessory designed and sold as a brace doesn’t turn a pistol into an SBR.
- Stocks are designed to be shouldered. Attaching one to a receiver with a sub-16″ barrel automatically creates an SBR under federal law.
Q: So, what’s the bottom line?
A: Mock v. Garland cleared the way to legally use a pistol brace on a sub-16″ build without registering it. It provides no legal protection for attaching a traditional stock. If you want to build an SBR – a firearm designed to be shouldered with a barrel less than 16” long using a traditional buttstock – you still need an approved Form 1 (or Form 4) and an NFA tax stamp before making the swap.
The Bottom Line
By dropping its appeal in Mock v. Garland to the U.S. District Court for the Northern District of Texas, this Department of Justice rightly sided with Americans to let stand Judge Reed O’Connor’s decision to vacate the rule.
We haven’t often seen the federal government stand up for the Second Amendment, and it is heartening to see some government officials uphold the proper role of government – to protect and defend individual liberties – especially the Second Amendment.
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READ MORE: The Kayla Giles Case – “We Got Your Back” Isn’t Just a Slogan, It’s a Lifeline
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