Background
In 2023, six months after a mass shooting at a Chicago-area Independence Day parade killed seven people, Illinois enacted the Protect Illinois Communities Act. The law bans the manufacture, sale, delivery, purchase, and possession of assault weapons and large-capacity magazines (defined as magazines holding more than 10 rounds for rifles and shotguns, or more than 15 rounds for handguns), with exceptions for grenade launchers, .50 caliber rifles, and rate-of-fire enhancers. The Act includes a grandfather clause allowing existing lawful owners to retain previously owned items through a free registration process.
Multiple plaintiffs—including individuals, firearm retailers, and Second Amendment advocacy groups—sued state and local officials in the Southern District of Illinois, challenging the Act as a violation of the Second Amendment. After initially granting preliminary relief, the district court later held a four-day bench trial. The district court concluded the Act violated the Second Amendment and enjoined enforcement of the entire statute. The defendants appealed.
The Court’s Holding
The Seventh Circuit reversed the district court’s injunction and upheld the Act. The panel assumed (without deciding) that AR-15s and 30-round magazines constitute “Arms” protected by the Second Amendment’s plain text, and proceeded directly to the second step of the Bruen framework. Under Bruen v. New York State Rifle & Pistol Association (2022), once the Second Amendment covers conduct, the government must demonstrate the regulation is consistent with the nation’s historical tradition of firearm regulation.
The court held that Illinois satisfied this burden. The opinion identified a long historical tradition of regulating particularly dangerous weapons—from pre-Founding laws against carrying certain arms, through Reconstruction-era restrictions on Bowie knives, to the twentieth-century federal machine gun ban. The court emphasized that Bowie knives, though lawfully possessed by ordinary citizens for self-defense and hunting, were nonetheless subject to regulation despite their common use. The panel concluded AR-15s and large-capacity magazines fit comfortably within this tradition of restricting weapons of unusual danger and lethality.
The court noted that all federal circuits to address the issue agreed with this conclusion, and that the Supreme Court’s decision in United States v. Rahimi clarified that modern firearm regulations do not require close founding-era comparators. The majority rejected the plaintiffs’ facial challenge because they failed to address all items regulated by the Act and thus could not meet the demanding standard requiring that no set of circumstances exists under which the law would be valid.
Key Takeaways
- The Second Amendment does not preclude states from banning AR-15s and large-capacity magazines under the historical-tradition test established in Bruen.
- A regulation is constitutionally permissible if it aligns with the nation’s long-standing tradition of restricting particularly dangerous weapons, even if the specific weapon (AR-15) differs from historical examples (Bowie knives, machine guns).
- Facial constitutional challenges in Second Amendment cases face a high bar: plaintiffs must show no set of circumstances exists under which a law would be valid, requiring them to address every item the law regulates.
- The historical tradition inquiry does not require close temporal or functional comparators between modern and founding-era weapons; broader principles of regulating dangerous arms suffice.
- Federal circuit consensus supporting assault weapons bans is now unanimous across six circuits (First, Second, Fourth, Seventh, Ninth, and D.C.).
Why It Matters
This decision marks a significant reaffirmation of state authority to regulate firearms post-Bruen. Although the Supreme Court’s Bruen decision appeared to tighten Second Amendment protections by requiring historical analogues, courts have largely interpreted it to preserve substantial regulatory authority over “particularly dangerous” weapons. This Seventh Circuit opinion, arriving amid complete circuit consensus, effectively forecloses federal constitutional challenges to AR-15 and large-capacity magazine bans—the most heavily litigated firearms restrictions since Bruen. For practitioners, the decision clarifies that historical regulations need not be temporally or functionally identical to modern restrictions, so long as they embody the same regulatory principle (restricting outlier weapons).
The ruling also has significant implications for law enforcement and public safety policy. It enables Illinois’s approach of grandfather-clause protection for existing owners while prohibiting future manufacture and sale—a compromise that the court found constitutionally sound. Notably, the panel declined to address whether the Act’s restrictions on semiautomatic pistols and shotguns, .50 caliber rifles, and certain attachments are constitutional, leaving those questions open for as-applied challenges and leaving two related cases pending in the Northern District of Illinois in the same posture.