Second Amendment — Right to Keep and Bear Arms
The Second Amendment provides: "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 American history, this provision was interpreted as protecting a collective right tied to militia service, not an individual right to own firearms. That changed definitively in District of Columbia v. Heller (2008), where the Supreme Court held that the Second Amendment protects an individual right to possess firearms for traditionally lawful purposes — most importantly, self-defense in the home — unconnected to service in a militia. McDonald v. City of Chicago (2010) extended this right to state and local governments through the Fourteenth Amendment. Most recently, New York State Rifle & Pistol Association v. Bruen (2022) established a new framework for evaluating firearms regulations: the government must demonstrate that a challenged regulation is "consistent with this Nation's historical tradition of firearm regulation." Under Bruen, courts must look to the historical record — from the Founding Era through Reconstruction — to determine whether a modern gun law has a sufficient historical analogue. This "text, history, and tradition" test has replaced the means-end scrutiny (intermediate scrutiny) that lower courts had previously applied, generating a wave of litigation challenging federal and state firearms laws from age restrictions to assault weapon bans to domestic violence prohibitions. See Federal Firearms Law for the statutory framework, ATF for the enforcement agency, and Federal Court System for where these challenges are heard.
Current Law (2026)
| Parameter | Value |
|---|---|
| Constitutional provision | Second Amendment (1791); incorporated against states via Fourteenth Amendment (McDonald, 2010) |
| Individual right | Right to possess firearms for self-defense in the home (Heller, 2008) |
| Legal test | "Text, history, and tradition" — regulation must be consistent with Nation's historical tradition (Bruen, 2022) |
| Not absolute | Heller recognized "presumptively lawful" regulations: felon prohibitions, sensitive places, commercial sales conditions |
| Key cases | Heller (2008), McDonald (2010), Bruen (2022), United States v. Rahimi (2024) |
| Federal firearms law | 18 U.S.C. §§ 921–931 (Gun Control Act); 26 U.S.C. §§ 5801–5872 (NFA) |
| Annual litigation | Hundreds of Second Amendment challenges filed post-Bruen |
Legal Authority
- U.S. Constitution, Amend. II — "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"
- 18 U.S.C. § 922(g) — Federal firearms prohibitions (felons, domestic violence misdemeanants, drug users, the mentally adjudicated, and others prohibited from possessing firearms — subject to Second Amendment challenge)
How It Works
The Heller/McDonald foundation. Heller established three key principles: (1) the Second Amendment protects an individual right — not merely a collective right tied to militia service; (2) the core of that right is self-defense, particularly in the home; and (3) the right is not unlimited — Heller identified "presumptively lawful regulatory measures" including prohibitions on felons and the mentally ill possessing firearms, laws forbidding firearms in sensitive places (schools, government buildings), and conditions on the commercial sale of arms. McDonald (2010) incorporated the right against state and local governments — every firearms regulation at every level of government is now subject to Second Amendment scrutiny. The anti-commandeering doctrine under the Tenth Amendment separately limits federal power to conscript state officials into enforcing federal gun laws.
The Bruen historical-tradition test. Bruen fundamentally changed how courts evaluate firearms regulations. Before Bruen, most lower courts used a two-step framework: (1) does the regulation burden Second Amendment conduct? (2) if so, apply means-end scrutiny (usually intermediate scrutiny — does the law substantially relate to an important government interest?). Bruen rejected this: the government must now demonstrate that its regulation is "consistent with the Nation's historical tradition of firearm regulation" by identifying a historical analogue — a regulation from the Founding Era, Reconstruction, or other relevant historical period that is "relevantly similar" to the challenged modern law. This has sent courts deep into historical research — evaluating colonial-era surety laws, antebellum concealed-carry restrictions, Reconstruction-era racial disarmament, and 19th-century sensitive-places restrictions.
Post-Bruen challenges. Since Bruen, courts have faced Second Amendment challenges to virtually every category of firearms regulation: felon-in-possession (18 U.S.C. § 922(g)(1) — upheld in most circuits; the NICS background check system enforces these prohibitions at point of sale), domestic violence restraining orders (United States v. Rahimi, 2024 — the Supreme Court upheld § 922(g)(8), holding that the historical tradition supports disarming individuals who pose a credible threat to others), age restrictions (under-21 bans on handgun purchases — split outcomes), assault weapon and large-capacity magazine bans (actively litigated, outcomes vary), and ghost gun regulations (serialization requirements challenged). The Bruen framework has created significant uncertainty, with courts reaching different conclusions about the same regulations.
How It Affects You
If you're a gun owner concerned about your Second Amendment rights: New York State Rifle & Pistol Ass'n v. Bruen (2022) established the current constitutional test: firearm regulations must be consistent with the historical tradition of firearm regulation in America at the Founding and Reconstruction eras. The Court discarded the interest-balancing approach that most lower courts had used since Heller (2008). What this means in practice: regulations that lack a "historical analogue" — a well-established 18th or 19th century tradition of similar regulation — face serious constitutional challenge. Post-Bruen courts have struck down various regulations while upholding others. Presumptively constitutional (as stated in Heller and Bruen): prohibitions on possession by felons and the mentally ill; laws forbidding carrying in "sensitive places" (government buildings, schools, polling places); conditions on commercial sale; and prohibitions on unusually dangerous weapons. Under active constitutional litigation: assault weapon bans, magazine capacity limits, "sensitive place" expansions to cover broad swaths of public space, and various state licensing requirements. For practical guidance: the Second Amendment Foundation and Firearms Policy Coalition maintain databases of current litigation. State law varies enormously — check your state's specific laws on carrying, purchasing, and storage.
If you're a state or local legislator drafting gun safety laws: After Bruen, you must build a historical foundation for any new firearm regulation. The Bruen test asks whether the challenged regulation is "relevantly similar" to historical regulations that were understood to be consistent with the Second Amendment at the time of ratification (1791) and the Fourteenth Amendment's ratification (1868). Working with historians and constitutional law scholars is not just advisable — it may be legally necessary to survive a facial challenge. Regulations most likely to survive: those with clear historical analogues (carrying restrictions in specific sensitive locations, disarming individuals adjudicated as mentally dangerous, prohibitions on specific dangerous individuals). Regulations most at risk: broad location restrictions without historical precedent, novel disarming requirements without a Founding-era analogue, and capacity or feature restrictions that lack historical parallels. United States v. Rahimi (2024) confirmed that disarming individuals subject to domestic violence civil protective orders survives Bruen — the Court emphasized that the historical tradition doesn't require a "dead ringer" but rather a "well-established and representative historical analogue."
If you're subject to a federal firearms prohibition under 18 U.S.C. § 922(g): The federal prohibited persons list bars firearm possession by: convicted felons; fugitives; unlawful users of controlled substances; persons adjudicated as "mentally defective" or committed to a mental institution; illegal aliens; those dishonorably discharged from the military; persons subject to certain domestic violence restraining orders; and those convicted of domestic violence misdemeanors. Post-Bruen, many of these prohibitions are being challenged: courts have struggled particularly with the prohibition on unlawful controlled substance users (as marijuana use becomes legal in more states), and the "adjudicated as mentally defective" standard. United States v. Rahimi (2024) upheld the § 922(g)(8) prohibition on firearm possession by persons subject to domestic violence protective orders — "even if not a 'felon' in the traditional sense." For those with prior convictions: federal law provides no general restoration process for firearm rights except presidential pardon; state restoration of civil rights may restore federal firearm rights in some circumstances, depending on circuit, under Caron v. United States (1998). Consult a firearms attorney if you have any conviction and are uncertain about your status. Unconstitutional enforcement of firearms laws by state officials can be challenged through Section 1983 civil rights lawsuits.
If you're a domestic violence survivor, safety advocate, or public health researcher: Rahimi is the most significant recent Second Amendment ruling for domestic violence policy. The Supreme Court (8-1) upheld 18 U.S.C. § 922(g)(8) — the federal prohibition on firearm possession by persons subject to civil domestic violence restraining orders — finding that the historical tradition of disarming "dangerous" individuals supports this modern application. The practical impact: judges issuing civil protective orders can check a box triggering a federal firearms prohibition that law enforcement can enforce; the Violence Against Women Act's lethality research consistently shows that the presence of a gun in a domestic violence situation dramatically increases the risk of homicide. Access to removed firearms remains an implementation challenge — few states have systematic processes for ensuring that newly prohibited persons actually surrender firearms after a protective order is issued. For researchers: the CDC's National Violent Death Reporting System and studies comparing homicide rates in states with vs. without "dating partner" prohibitions provide the empirical foundation for policy advocacy on Second Amendment limits.
State Variations
The Second Amendment applies to all levels of government:
- State firearms laws vary enormously — from permissive (constitutional carry, no permit required) to restrictive (assault weapon bans, red flag laws, universal background checks)
- 46 states have their own right-to-bear-arms provisions in their state constitutions — some are more protective than the federal Second Amendment
- Post-Bruen, state laws are being challenged at an unprecedented rate
- Some states have enacted new firearms regulations despite Bruen — testing the boundaries of the historical-tradition test
Implementing Regulations
The Second Amendment is a constitutional provision — no CFR implementing regulations for the right itself. Federal firearms regulations implement the statutory framework that operates within Second Amendment constraints: 27 CFR Part 478 (ATF firearms regulations), 27 CFR Part 479 (National Firearms Act machine guns/short-barreled weapons). The scope of Second Amendment protection is defined by District of Columbia v. Heller (2008, individual right), McDonald v. City of Chicago (2010, incorporation), and New York State Rifle & Pistol Association v. Bruen (2022, text/history/tradition test).
Pending Legislation
Second Amendment issues arise in firearms legislation — see Federal Firearms Law and ATF Firearms & Explosives.
Recent Developments
United States v. Rahimi (2024) was the first major Supreme Court application of Bruen's historical framework — upholding § 922(g)(8) and providing guidance on how to apply the historical-tradition test. The Court clarified that the test requires a historical principle, not a historical twin — the government need not find an identical historical regulation, just one with a relevantly similar justification and burden. Lower courts continue to wrestle with Bruen — producing divergent results on age restrictions, assault weapon bans, gun-free zones, and ghost guns. The Fifth and Eighth Circuits have found § 922(g)(3) (drug user prohibition) unconstitutional under Bruen; other circuits have upheld it. The Supreme Court is likely to take additional Second Amendment cases to resolve circuit splits.
- Assault weapon ban circuit split deepens (2025-2026): Federal circuit courts have issued conflicting rulings on assault weapon bans and high-capacity magazine restrictions under Bruen. The Fourth Circuit upheld Maryland's assault weapon ban finding a historical tradition of regulating "weapons of war"; the Ninth Circuit divided sharply on California's assault weapon and magazine restrictions. The Supreme Court has declined cert on some assault weapon cases while accepting others — the cases accepted focus on whether the historical tradition test applies to weapons "in common use" differently than to restrictions on magazines, accessories, and classes of weapons.
- Constitutional carry spread (2023-2025): More than half of U.S. states now have "constitutional carry" laws permitting concealed carrying of firearms without a permit. Bruen struck down New York's permit requirement for public carry; following Bruen, multiple states expanded their permit-free carry laws. The practical impact has been studied by researchers with mixed findings on crime effects; law enforcement has generally opposed permitless carry as complicating police encounters. Illinois and several other states are currently litigating whether their permit requirements survive Bruen.
- Trump gun policy and ATF (2025): The Trump administration has reversed multiple Biden-era ATF regulations. The pistol brace rule (classifying pistol-brace-equipped firearms as short-barreled rifles requiring NFA registration) was rescinded by executive order and CRA. ATF's "engaged in the business" rulemaking (expanding who must obtain a federal firearms license) is being reconsidered. The Trump ATF has signaled a reduced enforcement role and stated it will focus on violent crime rather than regulatory enforcement against gun stores and collectors.
- Red flag laws post-Bruen: Extreme Risk Protection Orders (ERPOs, or "red flag laws") — which allow courts to temporarily remove firearms from individuals deemed a danger to themselves or others — have been challenged under Bruen. Challengers argue there is no historical tradition of disarming individuals based on predicted future dangerousness (as opposed to present criminal conduct). Courts have generally upheld ERPOs under Rahimi's principle about disarming dangerous individuals, but the constitutional framework remains uncertain. 21 states now have red flag laws; the Bipartisan Safer Communities Act incentivized state adoption.