What States Have Magazine Capacity Laws in the United States?

Magazine capacity laws are one of the most important—and most commonly misunderstood—firearm regulations in the United States.

These laws vary by state and can create serious legal issues, even if your use of force is completely justified. If you carry a firearm, travel, or train across state lines, you need to understand where these restrictions exist.

What Is a Magazine Capacity Law?

A magazine capacity law limits how many rounds a firearm magazine can hold.

Examples:

10-round limit → magazines over 10 rounds are restricted
15-round limit → allows some standard magazines, but not all

Depending on the state, these laws may apply to:

Possession
Sale
Transfer
Manufacturing

States With Magazine Capacity Laws (United States)

The following states—and Washington, D.C.—have magazine capacity restrictions:

California, Colorado, Connecticut, Hawaii, Maryland, Massachusetts, New Jersey, New York, Vermont, Washington, and Washington, D.C.

Most of these jurisdictions enforce a 10-round limit, including California, New Jersey, New York, Massachusetts, Connecticut, Hawaii (for handguns), and D.C. Colorado allows up to 15 rounds, while Vermont uses a split system—15 rounds for handguns and 10 rounds for rifles. Washington and Maryland primarily restrict the sale and transfer of magazines over 10 rounds rather than simple possession, which creates additional legal nuance.

Magazine Capacity Laws by State (Quick Reference)

State / Jurisdiction	Limit	Applies To	Key Notes
California	10 rounds	Possession, sale, transfer	Strict enforcement; “large-capacity magazines” broadly defined
Colorado	15 rounds	Sale, transfer, manufacture	Possession allowed if owned prior to July 1, 2013 (grandfathered)
Connecticut	10 rounds	Possession, sale, transfer	Registration required for grandfathered magazines
Hawaii	10 rounds	Handguns only	Applies to handgun magazines only
Maryland	10 rounds	Sale, transfer	Possession generally allowed; cannot purchase in-state
Massachusetts	10 rounds	Possession, sale, transfer	Pre-ban magazines allowed (before 1994)
New Jersey	10 rounds	Possession, sale, transfer	Very strict; minimal exceptions
New York	10 rounds	Possession, sale, transfer	Prior 7-round limit struck down; now 10 rounds
Vermont	15 (handguns) / 10 (rifles)	Sale, transfer, possession	Split limits based on firearm type
Washington	10 rounds	Sale, distribution	Possession generally allowed if already owned
Washington, D.C.	10 rounds	Possession, sale, transfer	Strict enforcement similar to CA/NJ

Key Differences Between States

Magazine laws are not uniform. Understanding the differences is critical.

Possession vs. Sale

Some states restrict possession outright, meaning you cannot legally have a magazine over the limit:

California
New Jersey
New York

Other states mainly restrict sale or transfer, but not possession:

Maryland
Washington

“Grandfathered” Magazines

Some states allow continued possession of magazines owned before a certain date.

Examples include:

Massachusetts (pre-ban magazines)
Connecticut and New York (limited grandfathering depending on circumstances)
Colorado (magazines owned prior to July 1, 2013)

In Colorado, magazines over 15 rounds are generally only lawful if they were owned before July 1, 2013. However, there is typically no clear way to prove when a magazine was acquired, which can become a point of contention in an investigation or prosecution.

These situations are highly fact-specific and may require proof of prior ownership depending on the circumstances.

Handgun vs. Rifle Differences

Not all states treat firearms the same:

Hawaii → handgun magazines only
Vermont → different limits for handguns vs. rifles
Other states → apply limits broadly

Magazine “Blocking” and Compliance (What Actually Counts?)

In states with magazine limits, some people attempt to “block” higher-capacity magazines down to a legal limit. This is one of the most misunderstood—and risky—areas of compliance.

What Is a Blocked Magazine?

A blocked magazine is modified so it cannot accept more than the legal number of rounds.

Common methods include:

Plastic inserts or limiters
Internal blocks
Baseplate modifications
Metal rivets

Temporary vs. Permanent Modifications

This is where people get into trouble.

Some states require modifications to be:

Permanent
Not readily reversible

A simple plastic insert may be viewed as easily removable, meaning the magazine is still considered illegal under laws that reference “readily convertible” capacity.

Plastic Blockers vs. Rivets

A plastic blocker alone may not be enough in stricter states
A metal rivet or permanent modification is more commonly accepted because it physically prevents full capacity and typically requires tools to reverse

Even then, there is no universal standard.

Prosecutor Interpretation Matters

Even if you believe your magazine is compliant:

Law enforcement may interpret it differently
A prosecutor may argue it is still a prohibited magazine
The burden may fall on you to prove compliance

This becomes especially important after a defensive incident.

Best Practice

Use factory-compliant magazines whenever possible
Avoid easily reversible modifications
If modifying, ensure it is as permanent as possible
Understand the exact wording of your state’s law

Are Magazine Capacity Laws Constitutional?

Magazine capacity laws are actively being challenged across the United States, and their constitutionality is not fully settled.

Following the U.S. Supreme Court decision in New York State Rifle & Pistol Association v. Bruen, courts now evaluate firearm laws based on the historical tradition of firearm regulation.

The Current Reality

There is no definitive nationwide ruling from the U.S. Supreme Court specifically on magazine capacity limits.

Some courts have upheld these laws
Others have challenged or struck them down
Many cases are still ongoing

As a result, these laws remain enforceable where they exist.

Ongoing Legal Challenges

Magazine capacity laws continue to be challenged in multiple states, including California, New Jersey, New York, Washington, and Colorado.

In Colorado, the 15-round magazine law has been challenged repeatedly since it was enacted in 2013, but it remains in effect today.

What This Means for You

There is a strong argument that standard-capacity magazines are commonly owned and used for lawful purposes. At the same time, states argue these laws regulate equipment, not the ability to own a firearm.

Both sides are still being tested in court.

Bottom Line

Whether magazine capacity laws are constitutional is still an open question.

You may believe they are unconstitutional—and many do—but they are still enforceable law right now. A final answer will likely require a ruling from the U.S. Supreme Court, and there is no clear timeline for when that will happen.

Why This Matters in a Self-Defense Situation

After a defensive shooting, investigators may examine:

Magazine capacity
Legal compliance
How the magazine was acquired

Even if the use of force is justified, a non-compliant magazine can lead to:

Separate criminal charges
Seizure of your firearm
Additional scrutiny in court

Traveling Across State Lines

Magazine laws are state-specific.

A 15-round magazine legal in Colorado may be illegal in California or New Jersey
Reciprocity does not apply to magazine capacity
Transporting non-compliant magazines into another state can create legal exposure

Best Practices

Know the law in your state and any state you travel to
Use 10-round magazines when traveling for maximum compliance
Avoid transporting non-compliant magazines across state lines
Keep documentation if relying on grandfathered magazines

Q&A Section

What states have magazine capacity laws in the U.S.?

California, Colorado, Connecticut, Hawaii, Maryland, Massachusetts, New Jersey, New York, Vermont, Washington, and Washington, D.C.

What is the most common magazine limit?

The most common limit is 10 rounds, with Colorado (15 rounds) and Vermont (split limits) being exceptions.

Are blocked magazines legal?

It depends on the state. Some require permanent modifications, and others prohibit magazines that can be readily converted back to higher capacity.

Can you be charged even if the shooting was justified?

Yes. Magazine violations are separate from self-defense law and can result in additional charges.

Final Thoughts

Magazine capacity laws are one of the easiest ways to unintentionally violate firearm law in the United States.

They don’t determine whether you can defend yourself—but they can absolutely affect what happens afterward.

If you carry a firearm, this is something you need to understand before you ever leave your home state.

Colorado Concealed Handgun Permit (CHP) Class

If you live in Colorado and are applying for or renewing a Concealed Handgun Permit (CHP), state law requires completion of a qualifying training course taught by a verified instructor. Our Colorado CHP classes meet current statutory requirements and include legal instruction, firearms safety, and required certification documentation.
View upcoming Colorado CHP classes and sign up here: Colorado Concealed Handgun Permit Class

Self-Defense Insurance

Even a lawful act of self-defense can trigger criminal investigations, civil lawsuits, and significant legal costs. Many CCW holders evaluate self-defense insurance or legal protection plans to help manage those risks—coverage varies by provider and state, so understanding the differences matters.
Learn more and compare options here: Self-Defense Insurance Comparison

Other Related Articles:

Legal Disclaimer

Legal Disclaimer: This information is provided for educational purposes only and does not constitute legal advice. Firearm laws can change, and local, state, federal, tribal, and municipal regulations may vary. Always verify current laws and consult a qualified attorney before carrying a firearm or making legal decisions related to self-defense. US Firearms Training Academy assumes no liability for actions taken based on this content.