Mountain Gun Owners v. Polis

What the court held

Gun-rights groups challenged Colorado's HB 1224, which bans the sale, transfer, or possession of magazines holding more than fifteen rounds, solely under the right-to-bear-arms clause of the Colorado Constitution. The Colorado Supreme Court rejected plaintiffs' reading that the statute effectively covers all magazines with removable base pads, and, applying its Robertson reasonableness test, held the law is a reasonable exercise of the police power that neither has the purpose nor effect of nullifying the state right to bear arms in self-defense. The court expressly did not address any Second Amendment question, which plaintiffs had not raised.

Summarized from the court's opinion.

What this case is about

Colorado large-capacity magazine ban under the state constitutional right to bear arms

GunMapUSA summary of the issue, not a quotation from the court.

Key Dates

• 2020-06-29 — Decided

Sources

• CourtListener — retrieved 2026-08-08