No, the Second Amendment does not apply to all weapons. The Supreme Court has held that the right to keep and bear arms covers weapons “in common use” by law-abiding citizens for lawful purposes like self-defense, and excludes weapons that are “dangerous and unusual.” Handguns sit firmly on the protected side. Machine guns, grenades, and other heavy ordnance sit firmly on the unprotected side. A large contested middle — semiautomatic rifles like the AR-15, large-capacity magazines, and newer weapons — is where most current litigation happens.
The Line the Supreme Court Drew
The framework comes from District of Columbia v. Heller (2008), the case that first recognized an individual right to possess firearms for self-defense in the home. Writing for the majority, Justice Antonin Scalia said the right is “not unlimited.” The Amendment protects weapons “in common use for lawful purposes,” while “dangerous and unusual weapons” fall outside its reach entirely. Scalia cited “M-16 rifles and the like” as examples of arms that can be banned.1Justia. District of Columbia v. Heller, 554 U.S. 5702TalksOnLaw. Which Weapons Get 2nd Amendment Protection
Two categories, then. Weapons in common use are covered; outright bans on them face serious constitutional obstacles. Weapons that are dangerous and unusual are categorically excluded, and can be banned without raising a Second Amendment problem at all. The Court traced this exclusion to a centuries-old tradition of prohibiting weapons designed to terrorize rather than defend.1Justia. District of Columbia v. Heller, 554 U.S. 570
Courts generally translate “common use” into a question about actual civilian ownership: is the weapon “typically possessed by law-abiding citizens for lawful purposes?” The emphasis is on ownership patterns, not theoretical lethality.3National Constitution Center. Second Amendment Interpretations
Weapons That Are Protected
Handguns are the clearest example. The Heller Court called them “an entire class of ‘arms’ that Americans overwhelmingly choose for the lawful purpose of self-defense,” and struck down Washington, D.C.’s near-total handgun ban on that basis.1Justia. District of Columbia v. Heller, 554 U.S. 570
But the Amendment isn’t limited to firearms. In Caetano v. Massachusetts (2016), the Supreme Court unanimously vacated a conviction for possessing a stun gun. The state court had reasoned that stun guns fell outside the Amendment because they didn’t exist in 1791. The Supreme Court rejected that reasoning, holding that the Amendment “extends, prima facie, to all instruments that constitute bearable arms, even those that were not in existence at the time of the founding.”4Oyez. Caetano v. Massachusetts5California Law Review. Caetano: A Dangerous Misreading of Unusual in Heller
Bladed weapons and martial arts weapons have followed. In 2024, the Massachusetts Supreme Judicial Court unanimously struck down that state’s 67-year-old switchblade ban in Commonwealth v. Canjura, holding that Second Amendment protections are “not limited to firearms” and that switchblades are in common use for lawful purposes. Massachusetts couldn’t point to a founding-era tradition of banning bladed weapons.6Commonwealth Beacon. SJC Rules Mass. Switchblade Ban Unconstitutional A federal court in New York reached a similar conclusion about nunchaku in Maloney v. Singas (2018), striking down that state’s total ban after finding the government had offered almost no evidence for a public safety rationale and that nunchaku are commonly possessed for martial arts training.7Reason. Nunchakus Are Protected by the Second Amendment
Weapons That Are Not Protected
Machine guns are the cleanest example on the other side. Federal law bans the transfer and possession of machine guns manufactured after May 19, 1986, under the Firearm Owners’ Protection Act, which amended the Gun Control Act.8ATF. National Firearms Act Courts have consistently upheld that ban. In United States v. Bridges (2025), the Sixth Circuit held that machine guns are “dangerous and unusual” weapons not protected by the Second Amendment because they are not “typically possessed by law-abiding citizens for lawful purposes.”9Courthouse News Service. United States v. Bridges, Sixth Circuit Opinion The federal government has argued the Amendment does not grant a right to “wage war with military weapons.”10Courthouse News Service. Feds Insist Second Amendment Doesn’t Protect Machine Guns
The same reasoning has extended to “Glock switches” and similar conversion devices that turn semiautomatic pistols into fully automatic ones. In Taylor v. United States, the Fourth Circuit upheld the ban as applied to a handgun fitted with a switch, and the Supreme Court declined to review the decision in March 2026.11Duke Center for Firearms Law. SCOTUS Gun Watch
Farther out on the spectrum, there is broad consensus that heavy ordnance falls outside the Amendment entirely. Federal law classifies “destructive devices” — bombs, grenades, rockets, missiles, mines, and weapons with bore diameters over half an inch — as a regulated category under the National Firearms Act and Gun Control Act, subject to registration and transfer taxes.12Congressional Research Service. Destructive Devices and Federal Firearms Law No court has held these items are constitutionally protected. As Nelson Lund has written at the National Constitution Center, “no reasonable person could believe that … any individual should possess a nuclear weapon.”3National Constitution Center. Second Amendment Interpretations
The Weapons Courts Are Still Fighting Over
Between a standard handgun and a machine gun sits the most contested category: semiautomatic rifles like the AR-15 and magazines that hold more than ten rounds. Millions of Americans own them, which makes “common use” a genuine question rather than an easy one.
As of mid-2026, ten states and the District of Columbia ban various assault-style weapons, and more than a dozen states cap magazine capacity.13AP News. Supreme Court Rejects 2 Gun Rights Cases Lower courts have mostly upheld them. In Bianchi v. Brown (2024), the Fourth Circuit sitting en banc upheld Maryland’s assault weapons ban, ruling that AR-15-style rifles are “dangerous and unusual weapons” unsuitable for self-defense because of their military characteristics. The dissent argued the opposite: AR-15s are among the most popular rifles in America and are commonly used for self-defense and recreation, so they cannot be classified as unusual.14Harvard Law Review. Bianchi v. Brown, 111 F.4th 438
The Supreme Court has not yet settled the question. In June 2025, the justices rejected challenges to Maryland’s assault weapons ban and a Rhode Island magazine ban without explanation. Justice Clarence Thomas wrote that he “would not wait to decide whether the government can ban the most popular rifle in America.” Justices Alito and Gorsuch would have heard the cases. Justice Brett Kavanaugh, while agreeing to pass, said he is skeptical such bans are constitutional and expects the Court to take up the issue “in the next term or two.”13AP News. Supreme Court Rejects 2 Gun Rights Cases
Courts are also splitting on large-capacity magazine bans. Most federal circuits have upheld them. In March 2026, the District of Columbia Court of Appeals broke from the pack in Benson v. U.S., ruling that D.C.’s ban on magazines holding more than ten rounds violates the Second Amendment because such magazines are “bearable arms that are in common use for lawful purposes.”15SCOTUSblog. The Who, What, and Where of Gun Control Several magazine-ban petitions remain pending at the Supreme Court.
How Courts Decide These Cases Now
Since 2022, one framework governs Second Amendment challenges. In New York State Rifle & Pistol Association v. Bruen, the Supreme Court held that if a modern gun regulation burdens conduct covered by the Amendment’s text, the government must prove the regulation is “consistent with this Nation’s historical tradition of firearm regulation.”16Supreme Court of the United States. New York State Rifle & Pistol Assn. v. Bruen Courts can no longer balance public safety interests against gun rights through the kind of means-end scrutiny used elsewhere in constitutional law. The government has to find historical analogues.
The Court refined that test in United States v. Rahimi (2024), explaining that analogues need not be “dead ringers” for the modern law. They must be “relevantly similar” in purpose and operation, and courts should “seek harmony” with historical tradition rather than “manufacture conflict.”17Constitution Annotated. Second Amendment: Bruen and Rahimi18Cornell Law Institute. United States v. Hemani19Supreme Court of the United States. United States v. Hemani, Opinion
Regulations the Amendment Still Allows
Even for weapons that are protected, the right to possess them is not absolute. The Heller Court explicitly said its ruling should not cast doubt on several longstanding categories of regulation: bans on firearm possession by felons and the mentally ill, laws prohibiting firearms in sensitive places like schools and government buildings, and laws imposing conditions on the commercial sale of arms.20Cornell Law Institute. District of Columbia v. Heller, Syllabus So the question of whether a weapon is covered is separate from whether a particular person can possess it, or where, or under what conditions of sale.
Where the Line Sits Today
The Amendment protects bearable arms in common use by law-abiding citizens for lawful purposes. It does not protect weapons that are dangerous and unusual. Handguns, stun guns, switchblades, and nunchaku have all been placed on the protected side. Machine guns, conversion devices, grenades, and other destructive devices have been placed on the unprotected side. The AR-15 and the large-capacity magazine are the weapons whose status remains open, and multiple justices have signaled the Court will decide soon. The historical-tradition test from Bruen has made outcomes harder to predict, because the constitutionality of any given restriction now depends on whether the government can identify a sufficiently analogous regulation from the founding era — a task that gets harder as modern weapons diverge further from anything an 18th-century legislator would have recognized.