The D.C. Court of Appeals recently granted rehearing en banc in this case, which vacated the
March 5, 2026 panel decision described below.¹ The case will be reargued before the full court, and the analysis in this post reflects the panel decision as issued.

On March 5, 2026, the District of Columbia Court of Appeals invalidated D.C.’s ban on magazines holding more than ten rounds and vacated the defendant’s related firearm convictions. In Benson v. United States,² the majority framed these magazines as “arms” protected by the Second Amendment when they are in “common and ubiquitous use” by law-abiding citizens and found no historical tradition permitting blanket bans on such items. Applying the Supreme Court’s Heller/Bruen/Rahimi framework, the court found no tradition of prohibiting arms in common use and rejected analogies like gunpowder storage limits and Bowie knife regulations, which were regulations, not bans.

The court held that magazines of all capacities are “arms” because they facilitate armed self-defense and thus fall within the Second Amendment’s text, and that magazines holding more than ten rounds are in “common and ubiquitous use” nationwide and therefore cannot be categorically banned. Because the capacity ban was unconstitutional, the court also vacated the defendant’s related convictions for possession of an unregistered firearm, carrying a pistol without a license, and unlawful possession of ammunition, all of which stemmed from enforcement of the invalid ban.

Why this matters beyond gun law

Although this is a Second Amendment case, the reasoning set forth in the opinion touches three product-liability concepts that manufacturers and sellers of consumer products regularly confront: common use standards, consumer expectations, and risk-utility balancing. The decision’s language provides defense-side framing that may be persuasive when arguing design defect and warnings issues for widely adopted products.

Common use and “ordinary” product configurations

Product-liability claims often ask what is “ordinary” or “typical” about a product’s design and use.³ In Benson, the court repeatedly characterized 11+ round magazines as standard equipment with many of the most popular firearms and “ubiquitous” among law-abiding owners.

One can extrapolate from this that where a design feature is standard across a market and widely adopted by ordinary users, defendants can frame it as integral—not optional “excess”—which can undercut arguments that the configuration is unreasonably dangerous. Plaintiffs may still argue misuse or specific hazard profiles, but “common and standard” supports that the design tracks prevailing industry practice and user norms.

Consumer expectations: what users reasonably anticipate from the product

Design-defect theories that rely on consumer expectations turn on what ordinary users reasonably anticipate about product performance, features, and risks.⁴ In Benson, the majority treated higher-capacity magazines as commonly possessed for lawful purposes—including self-defense and practice—and rejected arguments that rarity of firing many rounds defeats protection.

This means that for mass-market products, evidence of widespread ownership and standard-feature status can support defense arguments that ordinary consumers expect the contested feature to be present and functional. While plaintiffs may argue that consumers expect added safeguards, defendants can respond that eliminating core, widely expected functionality would fundamentally alter the product and deprive it of its intended utility.

Risk-utility balancing: courts’ appetite for categorical restrictions

Many product-liability disputes pivot on whether a safer alternative design was feasible and whether overall utility justifies risk.⁵ In Benson, the majority rejected an interest-balancing approach and emphasized that outright bans on widely used arms lack historical support, distinguishing regulation from prohibition. 

In design-defect cases, plaintiffs often propose capacity or performance caps (speed limiters, power restrictors, volume ceilings) as “simple” safer alternatives. This decision provides language to argue that a categorical cap which removes core, market-standard utility is not a reasonable alternative design but a different product.

The dissent’s cautionary frame—and how plaintiffs may use it

The forceful dissent of Chief Judge Blackburne-Rigsby argued the majority misapplied Supreme Court guidance, relied too heavily on ownership statistics, and contradicted other courts upholding similar laws, foreshadowing potential further review. The dissent emphasized alignment of other federal and state appellate decisions upholding large‑capacity magazine restrictions and contended that a 30‑round magazine, like the one at issue, is not commonly used for lawful self‑defense.

Defendants should expect plaintiffs to emphasize heightened lethality, the marginal utility of extreme-capacity (or performance) configurations, and distinctions between “standard” and “extraordinary” options. They’ll argue that when incremental utility is low relative to risk, a cap or redesign is reasonable and expected.

Bottom line

The matter is not necessarily settled—the District may petition for rehearing or Supreme Court review, and a circuit split on the underlying question means the landscape will vary by jurisdiction. For defendants, however, the decision offers useful framing across three recurring battlegrounds:

• Document “common and standard” early. Where a challenged feature is standard equipment across a market, build the record from the outset—industry data, sales figures, and OEM configurations all support the argument that the design tracks prevailing practice, not exceptional risk.

• Tie consumer expectations to core functionality. Widespread ownership and standard-feature status support the argument that consumers expect the contested feature and that removing it would fundamentally alter the product—not make it safer.
• Challenge categorical caps as product substitution, not redesign. Where a plaintiff proposes a performance or capacity cap as a “reasonable alternative,” this decision provides language to argue that stripping market-standard utility produces a different product, not a safer one.

We will continue to monitor the en banc proceedings in Benson—including oral argument, the new round of briefing, and the court’s ultimate decision—and will provide updates as the case develops.

1. Benson v. United States, No. 23-CF-0514, 2026 WL 1098104, at *1 (D.C. Apr. 22, 2026). ↩︎
2. Benson v. United States, 352 A. 3d 719 (D.C. 2026). ↩︎
3. See, e.g., Tincher v. Omega Flex, Inc., 104 A.3d 328 (Pa. 2014). ↩︎
4. See, e.g., Aubin v. Union Carbide Corp., 177 So. 3d 489 (Fla. 2015). ↩︎
5. See, e.g., Branham v. Ford Motor Co., 700 S.E.2d 770 (S.C. 2010). ↩︎