US gun laws and the Second Amendment explained

Gun laws in the United States rest on two layers: federal rules that apply everywhere, and state rules that range from very permissive to very strict. Above both sits the Second Amendment, which the Supreme Court reads as protecting an individual right to keep and bear arms. This page explains the legal framework, the key court rulings, and the arguments on each side, without taking a position.

This page provides general, neutral information only and is not legal advice. Gun laws change often and differ by state, so check current rules with official sources.

What the Second Amendment says

Ratified in 1791 as part of the Bill of Rights, the amendment reads: "A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed."

For most of US history, the relationship between the "militia" clause and the "right of the people" was unsettled. A collective reading tied the right to organized militias. An individual reading treated it as a personal right. The Supreme Court adopted the individual reading in 2008.

The key Supreme Court rulings

Bruen's history-based test replaced the balancing tests many lower courts had used, and it has produced a steady stream of challenges to bans on certain weapons, magazine limits, age limits, and more. For how cases reach the Court, see the US judicial system.

Federal gun law

• National Firearms Act (1934): tightly regulates machine guns, short-barreled guns, and suppressors. Since January 1, 2026, the $200 federal tax on most of these items, including suppressors, has been $0, though registration still applies. Machine guns keep the tax, and civilians can generally own only those registered before 1986.
• Gun Control Act (1968): licenses gun dealers and bars certain people from having guns, including people with felony convictions, those under certain domestic violence orders, and most people in the US unlawfully.
• Brady Act (1993): led to the National Instant Criminal Background Check System (NICS), run by the FBI, which licensed dealers must use for each sale.
• Bipartisan Safer Communities Act (2022): expanded checks for buyers under 21, funded state crisis-intervention programs, and tightened rules on who must get a dealer's license.

Federal law sets a minimum age of 21 to buy a handgun from a licensed dealer and 18 for rifles and shotguns. It does not require background checks for private sales between individuals who are not in the business of selling guns. About 20 states add such a requirement. This is often called the "private sale exemption" or, by critics, a loophole. The Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF) enforces federal gun law.

There is no national gun registry, and federal law prohibits creating one. There was a federal ban on certain semi-automatic "assault weapons" from 1994 to 2004, but it expired and has not been renewed.

State gun laws

States can add rules on top of federal law. This is one of the clearest examples of states vs. federal power in practice.

A carry permit from one state may not be valid in another, since recognition depends on agreements between states. Travelers must check each state on their route. Federal law protects unloaded, locked-up transport through restrictive states in some circumstances, but that protection is narrow.

Guns in numbers

• Civilian guns: estimates run to around 400 million, more than one for every American, though ownership is concentrated. The most-cited estimate, from the Small Arms Survey, dates from 2018.
• Ownership: Pew Research Center surveys find that about a third of adults personally own a gun, and about four in ten live in a home with one.
• Deaths: the CDC counted 44,447 gun deaths in 2024, down from the peak years of the pandemic.
• Suicides and homicides: 27,593 of those deaths were suicides, a record number and about 62% of the total, and 15,364 were homicides.

Mass shootings get the most attention, but they account for a small share of gun deaths. They still drive much of the political debate.

The debate

Both labels cover a range of views, and polls often find majorities favoring specific measures, such as background checks, even among gun owners.

Arguments for gun rights

• Keeping and bearing arms is a constitutional right recognized by the Supreme Court.
• Guns are a means of self-defense, especially where police are far away.
• New restrictions mainly burden law-abiding owners, not criminals.
• Hunting and sport shooting are long-standing traditions in many regions.

Arguments for stricter regulation

• The US has far higher gun death rates than other wealthy countries.
• Universal background checks could keep guns from prohibited buyers.
• Waiting periods and red flag laws may prevent suicides and domestic killings.
• The Supreme Court itself has said that the right is not unlimited.

Politically, Republicans generally oppose new limits and Democrats generally favor them, as our comparison of the parties shows. Researchers disagree about how much specific laws change outcomes, partly because guns cross state lines and data are limited.

If you are visiting or moving to the US

Most foreign visitors and people on nonimmigrant visas cannot legally buy or possess a firearm. There are narrow exceptions, for example for licensed hunting trips. Green card holders are treated much like citizens under federal law, but state rules still apply. Getting this wrong can have severe criminal and immigration consequences, so seek legal advice before handling a gun in the US. At a shooting range, rules differ by state and by the range.

This page provides general, neutral information only and does not constitute legal advice.

Related articles:

• The US Constitution and the Bill of Rights
• Police and criminal justice in the US
• The US judicial system
• States vs. the federal government