Gun laws by state vary so widely in the United States that a firearm, magazine, or carry method that is perfectly legal in one state can be a felony a few miles across the border. Federal law sets a floor that applies everywhere, but each state builds its own framework on top of it. As of 2026, 29 states allow eligible residents to carry a handgun without any permit, while a handful require a license just to keep a firearm at home. Waiting periods, background check rules, magazine caps, assault weapon definitions, and self-defense standards all shift at the state line, and there is no single national standard.
The Federal Floor That Applies Everywhere
Before any state law enters the picture, federal law bars nine categories of people from possessing any firearm or ammunition. No state permit or constitutional carry statute overrides these prohibitions. You cannot legally possess a firearm under federal law if you have a felony conviction (any crime punishable by more than one year in prison, whether you served time or not), are a fugitive from justice, use or are addicted to a controlled substance, have been involuntarily committed to a mental institution or adjudicated mentally unfit, are in the country unlawfully or hold a nonimmigrant visa (with limited exceptions), were dishonorably discharged from the military, have renounced U.S. citizenship, are subject to a qualifying domestic violence restraining order, or have been convicted of a misdemeanor crime of domestic violence.1Office of the Law Revision Counsel. 18 USC 922 Unlawful Acts
The domestic violence provisions catch many people off guard. A misdemeanor conviction involving physical force against a spouse, former partner, or co-parent can permanently strip firearm rights, even though the underlying charge was relatively minor.
Federal law also prohibits knowingly possessing a firearm within 1,000 feet of a school, with exceptions for firearms kept on private property inside that zone, firearms carried by individuals with qualifying state-issued licenses, and unloaded firearms in locked containers.1Office of the Law Revision Counsel. 18 USC 922 Unlawful Acts Lying on the ATF Form 4473 that every dealer sale requires is a federal felony punishable by up to five years in prison.2Office of the Law Revision Counsel. 18 US Code 924 – Penalties
Permit Systems: What It Takes to Carry or Buy
States fall into three broad camps on whether you need government permission before carrying, and a few also require permission before purchasing.
Constitutional Carry (Permitless Carry)
Twenty-nine states allow residents who are legally eligible to possess firearms to carry them openly or concealed without a state permit. You simply cannot be a prohibited person under federal or state law. Most of these states still issue optional permits so residents can use reciprocity agreements when traveling, but the permit is not required for in-state carry. This model eliminates application fees, training costs, and waits that can stretch weeks or months elsewhere.
Shall-Issue States
In shall-issue states, the government must grant a carry permit to any applicant who meets specific, objective criteria. The issuing authority has no discretion to deny you if you check every box. Typical requirements include being at least 21, passing a background check, and in some states completing a safety or training course. Not every shall-issue state requires training. Carry permit fees run roughly $40 to several hundred dollars depending on the state.
May-Issue States
A shrinking number of states retain may-issue frameworks, where local officials have discretion to approve or deny based on demonstrated need. The Supreme Court’s 2022 decision in New York State Rifle & Pistol Association v. Bruen struck down New York’s requirement that applicants show “proper cause” beyond ordinary self-defense, holding that the Second Amendment protects a right to carry in public without proving special need. The practical effect has been a shift toward more objective standards even in historically restrictive states.
Purchase Permits and Possession Cards
Separate from carry permits, a few states require a license before you can buy or even possess a firearm at all. Illinois requires a Firearm Owner’s Identification card for anyone who wants to own a firearm or ammunition. Other states require a separate permit for each handgun purchase, with its own application and background check. Failing to maintain a required possession card can produce criminal charges even when the firearm was legally purchased.
Concealed Carry, Open Carry, and Crossing State Lines
Even in states that allow carry, how you carry matters. Concealed carry (firearm hidden from view) and open carry (visible, usually holstered) are treated as separate legal questions in most states. Some states allow open carry without any permit, others require one, and a few prohibit it entirely. Whether the firearm is a handgun or a long gun can also change the rules.
Local ordinances add another layer. Cities and counties may restrict firearms in municipal buildings, parks, or certain public spaces. Roughly 45 states have some form of preemption law that limits local governments from enacting their own gun rules, but the strength and scope of those laws vary.
Beyond the federal school zone rule, states designate their own restricted locations. Courthouses, government buildings, polling places, bars, hospitals, and houses of worship appear on various state lists. Violating a restricted-zone law can produce felony charges and permanent loss of firearm rights.
Reciprocity
If you hold a concealed carry permit and plan to travel, reciprocity is where things go wrong fastest. Reciprocity means one state recognizes permits issued by another. Some constitutional carry states broadly recognize all valid out-of-state permits. Others recognize only permits from states with comparable training and background check standards. Around ten states recognize no out-of-state permits at all, meaning visitors cannot legally carry concealed regardless of what license they hold at home. Before any interstate trip with a firearm, check the specific reciprocity agreements between your home state and every state you will enter.
Background Checks, Private Sales, and Waiting Periods
Every firearm sale through a licensed dealer triggers a federal background check through the National Instant Criminal Background Check System (NICS). Results come back as proceed, delayed, or denied. If a check is delayed, the FBI generally has three business days to resolve it before the dealer may legally complete the transfer. Some states act as a “point of contact,” running their own background checks using state databases in addition to the federal system, which can flag disqualifying records that have not yet reached the federal databases.
Federal law does not require background checks for private sales between individuals who are not licensed dealers. About 22 states and the District of Columbia have closed this gap by requiring checks on at least some private sales, and roughly 19 of those apply universal background checks to all sales of all firearm types. In practice, the private seller facilitates the transfer through a licensed dealer, who runs the check for a fee that commonly falls between $30 and $80.
Roughly a dozen states impose a mandatory delay between purchase and delivery. The shortest waiting periods are three days, used by states like Florida and Colorado. Several require seven days, and the longest reach 10 to 14 days. Some states exempt concealed carry permit holders from the waiting period on the theory that those individuals have already been screened.
Assault Weapon Bans, Magazine Limits, and NFA Items
Ten states currently ban firearms classified as “assault weapons,” though the definition varies. These laws typically target semi-automatic firearms with specific features like pistol grips, folding stocks, or flash suppressors, and some states also ban firearms by make and model. Possession of a banned weapon generally constitutes a felony.
Magazine capacity limits are slightly more common than assault weapon bans. The most typical cap is 10 rounds, though a few states set the limit at 15. Possessing an over-capacity magazine can result in charges ranging from misdemeanors to felonies. Some states grandfather magazines purchased before the ban; others require owners to permanently modify or surrender non-compliant magazines.
At the federal level, the National Firearms Act regulates suppressors, short-barreled rifles, short-barreled shotguns, machine guns, and destructive devices. A rifle with a barrel shorter than 16 inches or a shotgun shorter than 18 inches falls under NFA regulation.3Office of the Law Revision Counsel. 26 US Code 5845 – Definitions Transferring a machine gun or destructive device requires a $200 federal tax payment, along with registration, fingerprints, and photographs. Recent amendments to the tax code set the transfer tax at $0 for other NFA items like suppressors and short-barreled rifles.4Office of the Law Revision Counsel. 26 USC 5811 Transfer Tax
State law adds another layer. Some states completely ban NFA items regardless of federal compliance; others allow them with no restrictions beyond the federal process. Owning a suppressor legally under federal law does not protect you if your state prohibits it. States may also regulate accessories like binary triggers and armor-piercing ammunition independently.
Self-Defense Standards
Owning a firearm legally is one question. Using it is another, and the standards for justified use of force differ sharply by state.
Stand Your Ground
At least 31 states have enacted stand-your-ground laws, which eliminate any duty to retreat before using force in self-defense when you are in a place where you have a legal right to be. If you reasonably believe deadly force is necessary to prevent death or serious injury, you are not required to try to escape first. The force must still be proportional to the threat.
Duty to Retreat
The remaining states generally require you to retreat from a threat if you can safely do so before resorting to deadly force. The obligation applies only when retreat is possible without increasing your danger. Courts examine whether you had a realistic escape route and chose not to take it.
Castle Doctrine
Nearly every state recognizes some version of the castle doctrine, which removes the duty to retreat when you are inside your own home. Many castle doctrine laws create a legal presumption that someone who unlawfully enters your home intends to cause harm, shifting the burden away from you to justify your response. Some states extend the doctrine to occupied vehicles and workplaces. The consistent limitation: you cannot use deadly force against someone who has a legal right to be there, and you cannot provoke a confrontation and then claim self-defense.
Red Flag Laws and Storage Requirements
Twenty-two states and the District of Columbia have enacted extreme risk protection order laws, commonly called red flag laws, which allow courts to temporarily remove firearms from individuals who pose a significant risk of harm. These are civil orders, not criminal charges. A law enforcement officer or family member files a petition presenting evidence of danger. If the court finds the risk credible, it issues an order authorizing removal of firearms and prohibiting new purchases for the duration of the order. The person subject to the order has the right to a full hearing to contest it. States without these laws have no mechanism for preemptive firearm removal short of a criminal arrest or involuntary mental health commitment.
Roughly 26 states and the District of Columbia have child access prevention laws that create criminal liability when a minor gains access to an unsecured firearm. The strictest versions impose penalties if a child is merely likely to access a negligently stored gun. Others require proof that the owner intentionally or recklessly left the firearm accessible. Penalties range from misdemeanors to felonies depending on whether a child is injured. A growing number of jurisdictions also require firearms left in unattended vehicles to be locked in a container and out of plain view, and several states require you to report a lost or stolen firearm to law enforcement within a set timeframe, often 24 to 48 hours.
How States Stack Up
The categories above create a spectrum. Some states layer multiple restrictions; others rely almost entirely on the federal baseline.
Most Restrictive
California requires a background check for all firearm sales including private transfers, imposes a 10-day waiting period, bans defined assault weapons, and limits magazines to 10 rounds. New York requires a license to possess a handgun, bans most assault weapons, caps magazines at 10 rounds, and has required background checks for ammunition purchases, though that provision has faced recent legal challenges. Massachusetts uses a tiered licensing system that requires a License to Carry for handgun ownership and limits which firearm models dealers can sell through an approved roster. New Jersey requires a purchaser identification card for any firearm acquisition and a separate permit for each handgun, enforces a 10-round magazine limit, and bans many semi-automatic firearms classified as assault weapons.
Moderately Restrictive
Florida adopted permitless concealed carry in 2023 but still prohibits open carry in most public spaces and imposes a three-day waiting period for dealer purchases (waived for concealed carry permit holders). Illinois requires a Firearm Owner’s Identification card for any possession of firearms or ammunition and recently banned defined assault weapons and magazines over 10 rounds, though owners who registered existing items before the deadline may keep them. Connecticut bans various assault weapons, requires a certificate for possessing them, and enforces a 10-day waiting period for all transfers. Washington prohibits the manufacture and sale of defined assault weapons, limits magazines to 10 rounds, and requires a 10-business-day waiting period.
Least Restrictive
Texas allows permitless carry for adults 21 and older and imposes no magazine limits, no waiting period, and no state-level assault weapon restrictions. Arizona, Alaska, and similar constitutional carry states follow the same general model, relying primarily on the federal NICS check for dealer sales and imposing no state permit requirements for purchase or possession. These states still enforce all federal prohibited-person categories and gun-free zone restrictions.
The difference is not abstract. A 15-round handgun magazine that is perfectly legal to own and carry in Texas can produce criminal charges the moment you cross into a 10-round state. A handgun you can buy and carry in Arizona the same day requires weeks of paperwork, multiple permits, and significant fees in states at the other end of the spectrum. Before purchasing, transporting, or carrying a firearm across state lines, checking the specific laws of every state you will pass through is the single most important step you can take to avoid an unintentional felony.