Understanding Colorado’s Magazine Capacity Limit: An Overview of CRS 18-12-302

Colorado law restricts magazine capacity under Colorado Revised Statute § 18-12-302. This law, which took effect on July 1, 2013, makes it a criminal offense to possess, sell, or transfer any magazine that holds more than 15 rounds—unless specific exceptions apply.

What Is Colorado’s Magazine Capacity Limit?

• A “large-capacity magazine” (LCM) is any detachable magazine that holds more than 15 rounds.
• A round in the chamber does not count toward that 15-round limit.
• Possession of a prohibited magazine is a Class 2 misdemeanor.
• If the magazine is used during a felony or violent crime, the charge increases to a Class 6 felony.

Exceptions to the Law

1. Grandfathered Magazines

Magazines that were owned prior to July 1, 2013 and have been kept in continuous possession are exempt from the law.

2. Burden of Proof

If charged, and you claim the magazine was grandfathered, the burden is on the prosecution to prove otherwise.

3. Exempt Individuals and Entities

The following are not subject to the law:

• Colorado-based manufacturers transferring LCMs to the military, law enforcement, or out-of-state recipients.
• Employees of licensed gun dealers acting in the scope of their duties.
• Members of the armed forces or government agencies who use LCMs as part of official duties.
• Anyone lawfully transporting magazines out of state for licensed manufacturers.

Real-World Examples

Example 1: Illegal Possession

In 2024, John Doe buys a 30-round magazine online and uses it at a range in Colorado. A fellow shooter reports him. John is investigated, and it’s confirmed the magazine was acquired after July 1, 2013. He is charged with a Class 2 misdemeanor.

Example 2: Legal Grandfathered Possession

Jane Smith owns a 30-round magazine passed down from her father, who bought it in 2010. She’s had it continuously since 2012. During a check by a wildlife officer, Jane explains the history and has proof of legal possession. She is not in violation of CRS 18-12-302.

Why Are High-Capacity Magazines Still Sold?

Some Colorado gun stores sell magazine parts kits legally. These kits are intended for repairing existing magazines, not assembling new ones.

If you assemble a new high-capacity magazine from parts, and it holds more than 15 rounds and wasn’t owned before the 2013 cutoff, that’s a violation of CRS 18-12-302. The law targets complete, functional magazines—not individual parts—but intent and end use matter.

Moving to Colorado With High-Capacity Magazines

CRS 18-12-302 is silent on whether people moving into Colorado can legally bring high-capacity magazines they owned in other states. This legal gray area leaves many newcomers uncertain. If you’re relocating with LCMs, it’s strongly advised you seek legal guidance before bringing them into the state.

Upcoming Legislation – Effective August 1, 2026

In 2025, Colorado passed a new law that will expand restrictions on semiautomatic firearms and magazines, effective August 1, 2026. Under this law:

• Certain semiautomatic rifles with detachable magazines—including AR-15 and AK-pattern rifles—will be banned from sale in Colorado.
• Buyers must pass a background check and complete a state-approved firearm safety course for applicable firearm purchases.
• All new semiautomatic firearms sold must have fixed magazines with a maximum capacity of 15 rounds.

This legislation significantly expands Colorado’s regulation of firearms and adds new challenges for lawful gun owners. As always, firearm owners are encouraged to stay informed, trained, and legally prepared.

Final Thoughts

Colorado’s magazine limit law is just one part of a broader legislative framework that impacts responsible gun owners. CRS 18-12-302 imposes real restrictions, but it also includes important exceptions like grandfathered magazines and protections for manufacturers, military, and lawful dealers.

If you own firearms in Colorado, it’s your responsibility to stay compliant while defending your rights. Education, preparation, and proactive steps are essential—not only to avoid legal issues but to stand strong as a Second Amendment supporter.

Take the Next Step in Protecting Yourself

If you live in Colorado and want to stay on the right side of the law while exercising your Second Amendment rights:

• Get trained. Our Colorado Concealed Handgun Permit (CCW) classes cover firearms safety, Colorado use-of-force laws, and help you become a responsible, confident gun owner.
• Get protected. We also help you compare top-rated self-defense insurance plans so you’re legally and financially prepared in the event of a defensive use of force.
• Get Knowledgeable. We Offer Firearms Safety Courses that are required August 1st, 2025 to purchase semi auto firearms.

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Have questions? Call us at 720-924-6654 or email cccdinstructor@gmail.com — we’re here to help.

Legal Disclaimer: This article is for general informational purposes only and does not constitute legal advice. Always consult with a licensed attorney regarding specific legal questions or concerns.