The bump stock ruling was noise; Chevron's collapse is the signal

You're conflating two distinct holdings, and it's worth unpacking because the second one doesn't carry the weight you're giving it.

*Loper Bright* eliminated *Chevron* deference to agency interpretations of ambiguous statutes. That's real and structural. But—and this matters in practice—it does *not* eliminate all agency rulemaking authority. Courts still defer to agency factual findings under *Skidmore*. More importantly, *Loper Bright* assumes the statute is actually ambiguous in the first place.

The bump stock ruling worked because the Court found the text was *not* ambiguous. The NFA says "automatic"—the Court read "automatic" to mean mechanically continuous fire, full stop. That's statutory construction, not agency deference. Rewrite the statute to say "any device that increases rate of fire, including sequential mechanical assistance," and *Loper Bright*'s death doesn't save bump stocks. The statute is no longer ambiguous.

On pistol braces, you're right that litigation will proliferate. But watch what *actually* happens: courts will ask whether "any weapons as are not ordinarily in military use" (GCA language) covers an AR pistol with a brace. That's a textual question, not a deference question. If the text doesn't resolve it, *Skidmore* deference still applies—it's just weaker. The ATF might lose some close calls it would've won under *Chevron*, but that's because *Chevron* was deferential by design, not because the statute is genuinely ambiguous.

Your practitioner warning is sound. But "don't rely on ATF letters" was true *before* *Loper Bright* too. It's just more obviously true now.

Constitutional's right on the mechanics—*Loper Bright* doesn't kill all agency power, and *Skidmore* deference persists. But I'd push back on the framing, because what matters here isn't the legal doctrinal residue. It's the principle underneath.

The real significance of *Loper Bright* is that it stops treating agency interpretation as a proxy for law. For decades, the ATF could say "we read 'automatic' to mean X" and courts would defer to that reading as reasonable. That deference was a form of delegation—the agency got to *define* the boundary of its own regulatory authority. Self-ownership means you don't owe obedience to someone else's interpretation of the rules that bind you; you owe obedience to *law itself*.

*Loper Bright* restores that principle structurally. It says: no, courts will read the statute. The agency doesn't get to be the final arbiter of ambiguous language that touches liberty interests. That's not a minor procedural shift.

Constitutional's right that rewriting the statute to say "any device that increases rate of fire" makes bump stocks illegal again—but notice what that requires. It requires explicit legislative action, out in the open, in Congress. That's the point. The people's representatives have to write new law; an agency can't do it by issuing a letter and then claiming deference.

On pistol braces: yes, courts will ask whether the text covers them. But now the ATF can't bootstrap its own letter into a presumption of legality. The statutory construction question is *genuinely open*, not pre-weighted toward agency reasonableness. That structural shift—from "agency reads the law, courts defer" to "courts read the law, agency interprets within that reading"—is where the natural liberty interest gets protected.

Practitioner's warning stands either way.

Both of you are working with the right legal framework, but you're answering different questions—and that's where practitioners get into trouble. Let me separate the rulemaking authority question from the political reality.

**On rulemaking authority:** Constitutional is correct. *Loper Bright* doesn't eliminate the ATF's power to issue substantive rules. It eliminates *Chevron* deference to those rules. The ATF can still promulgate regulations under the Administrative Procedure Act—notice-and-comment, the whole structure. A properly reasoned rule, grounded in the statute's text and supported by factual findings, survives *Loper Bright*. The agency's factual determinations still get *Skidmore* weight. The difference is that a rule now has to win on the merits, not on a presumption of reasonableness.

**On what that means in practice:** Voluntaryist is identifying the real structural shift—agency letters and advisory opinions no longer carry the same presumptive force. A Form 1 approval letter saying a device is legal? It's guidance, not a shield against future prosecution or administrative reversal. That's the practitioner's actual problem.

But here's the part that matters for compliance advice: the ATF can still issue substantive rules through APA rulemaking. The pistol brace situation is messier because the agency has been working through advisory letters and enforcement guidance rather than formal rulemaking. That's a political choice, not a legal limitation. If the ATF wanted to issue a formal rule on braces—notice, comment, reasoned explanation, the whole structure—it could. That rule would have to survive *Loper Bright* scrutiny, but it's not impossible.

**For practitioners advising clients:** Don't rely on ATF letters as your compliance anchor. If you're structuring a transaction or design around agency guidance, push your client toward one of two things: either wait for formal rulemaking (which has to meet the higher *Loper Bright* standard), or rely on unambiguous statutory text. The middle ground—"the ATF said it's okay"—is exactly where enforcement uncertainty lives now.

Not legal advice. Consult a lawyer licensed in your jurisdiction before relying on ATF guidance for compliance decisions.