45 F.4th 306
D.C. Cir.2022Background
- After the 2017 Las Vegas mass shooting, ATF issued a December 2018 final rule classifying "bump‑stock‑type devices" as "machineguns" under the National Firearms Act (26 U.S.C. § 5845(b)) and the Gun Control Act, requiring owners to destroy or surrender them.
- A bump stock replaces a rifle's fixed stock with a sliding stock that harnesses recoil to cause the trigger to contact a stationary finger repeatedly, producing continuous fire after a single initial trigger pull. Plaintiffs did not dispute the District Court's factual findings about device operation.
- Plaintiffs (Guedes et al., and Firearms Policy Coalition among others) challenged the Rule; the District Court denied a preliminary injunction and later entered judgment for the government; earlier panels of the D.C. Circuit had affirmed preliminary denials and the Supreme Court denied certiorari.
- The principal legal question was whether the statutory phrase "shoots ... automatically ... by a single function of the trigger" covers bump stocks—specifically how to interpret "single function of the trigger" and "automatically."
- The D.C. Circuit (Wilkins, J.) declined to resolve Chevron deference here, instead applying ordinary tools of statutory interpretation (text, structure, history, purpose) and concluded ATF offered the best reading: "single function" = "single pull (and analogous motions)" and "automatically" = result of a self‑acting or self‑regulating mechanism.
- The court held that, under that best reading, bump stocks are "machineguns," and the rule of lenity did not apply because no grievous statutory ambiguity remained.
Issues
| Issue | Plaintiff's Argument | Defendant's Argument | Held |
|---|---|---|---|
| Whether the statutory definition of "machinegun" covers bump stocks | "Single function of the trigger" refers to the mechanical action of the trigger itself; bump stocks do not cause a single trigger function to fire multiple rounds | Statute contemplates a shooter‑focused "single pull (and analogous motions)" that initiates a self‑regulating automatic firing sequence; bump stocks cause multiple shots from one initial action | ATF's construction is the best reading; bump stocks are "machineguns" under the statute |
| How to interpret "single function of the trigger" and "automatically" | Plaintiffs: narrow, mechanistic meanings; "automatically" requires no further human input | ATF: "single function" = single pull (or analogous initiation); "automatically" = result of a self‑acting or self‑regulating mechanism (which can include continued human pressure) | Court adopts ATF's definitions as best statutory interpretation |
| Whether Chevron deference governs review of the Rule | Plaintiffs: Chevron inapplicable (rule interpretive; government waived; criminal context; lenity) | Government: Chevron would support agency construction | Court avoided Chevron analysis and resolved the case on the best reading under traditional interpretive tools; result would stand without deciding deference question |
| Whether the rule of lenity requires a narrower construction | Plaintiffs: ambiguity should be resolved in defendants' favor because the Rule carries criminal penalties | Government: statutory text, history, context resolve meaning; no grievous ambiguity remains | Lenity not applied—no grievous ambiguity after textual, historical, and contextual analysis |
Key Cases Cited
- Staples v. United States, 511 U.S. 600 (1994) (discusses "fires repeatedly with a single pull of the trigger" as a description of automatic weapons)
- Edelman v. Lynchburg College, 535 U.S. 106 (2002) (courts need not resolve deference questions when agency interpretation is the best reading)
- Maracich v. Spears, 570 U.S. 48 (2013) (rule of lenity applies only if grievous ambiguity remains after using interpretive tools)
- Muscarello v. United States, 524 U.S. 125 (1998) (lenity invoked only after exhaustion of interpretive aids)
- United States v. Olofson, 563 F.3d 652 (7th Cir. 2009) ("automatically" as result of self‑acting mechanism under NFA)
- Guedes v. ATF, 920 F.3d 1 (D.C. Cir. 2019) (earlier panel opinion addressing preliminary injunction and Chevron issues)
- Gun Owners of America v. Garland, 19 F.4th 890 (6th Cir. 2021) (en banc) (circuit consideration of bump stock rule)
- Aposhian v. Barr, 958 F.3d 969 (10th Cir. 2020) (upholding ATF's bump‑stock classification)
- United States v. Bass, 404 U.S. 336 (1971) (example of resort to lenity where statutory ambiguity persisted)