Duncan v. Bonta
In brief
- Where it stands
- Petition Pending
Awaiting an order on the petition
- What it’s about
- This case challenges California’s ban on firearm magazines that hold more than 10 rounds of ammunition, including the law’s requirement that owners give up magazines they had lawfully acquired.
- What's at stake
- The case could affect law-abiding Californians who want to possess ammunition-feeding devices that hold more than 10 rounds. It could also clarify how courts apply Second Amendment protections to commonly owned firearm equipment.
Summary: written with AI from the case record.

What it's about
This case challenges California’s ban on firearm magazines that hold more than 10 rounds of ammunition, including the law’s requirement that owners give up magazines they had lawfully acquired. The petitioners argue that these magazines are commonly owned for lawful purposes and therefore protected by the Second Amendment.
The petition relies on the Supreme Court’s earlier statements in Heller and Bruen that the Second Amendment protects arms commonly possessed for lawful purposes.
Question presented
Whether the Second Amendment protects the right of the people to possess these ubiquitous arms.
What happens next
The next step is a Court action on the petition or another scheduling move. No decision window is available yet.
Documents
Docket activity
Case data updated: summary, question_presented, generation_metadata
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AI analysis generated: Case Briefing
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Case data updated: documents, description, document_url, proceeding_type
Case data updated: documents, description, document_url, proceeding_type
Case data updated: documents, description, proceeding_type
Brief added: Petition
Court Order added: Lower Court Orders/Opinions
More questions
- What is at stake in Duncan v. Bonta?
- The case asks whether the Second Amendment protects possession of ammunition-feeding devices capable of holding more than 10 rounds.
- Who could be affected by the California ammunition-device ban?
- Law-abiding Californians seeking to possess devices holding more than 10 rounds could be directly affected. The case could also guide courts considering similar restrictions.
- What happens next in Duncan v. Bonta?
- The Supreme Court may act on the petition or take another scheduling step. Oral argument has not been scheduled.
Sources
Primary materials plus reporting. Best-effort analysis: this explainer relies on a mix of primary materials and trusted secondary sources. Official filings and opinions remain authoritative.