美国枪支法律入门：各州持枪规定的差异与安全课程

The United States has no single federal gun law; instead, a patchwork of state and local regulations governs who may purchase, carry, and use firearms. As of 2025, the FBI conducted over 38.6 million background checks through the National Instant Criminal Background Check System (NICS) in the prior year, reflecting sustained high demand for firearm purchases across the country. Meanwhile, the U.S. Government Accountability Office (GAO) reported in 2024 that approximately 22 states have enacted permitless carry laws, meaning eligible adults can carry a concealed firearm without a state-issued license. For international residents—including green card holders, visa holders, and newcomers—navigating this landscape is critical: a legal firearm owner in Texas could face felony charges for the same conduct in California. This guide breaks down the core differences in state gun laws, the role of federal firearm regulations, and the safety training options available to new owners. Understanding these rules is not optional—it is a legal and personal safety necessity for anyone living in or moving to the U.S.

Federal Baseline: Who Can and Cannot Own a Gun

The Gun Control Act of 1968 (GCA), enforced by the Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF), sets the federal eligibility floor. Under 18 U.S.C. § 922, a person cannot purchase or possess a firearm if they fall into any of nine prohibited categories: convicted of a crime punishable by more than one year in prison, a fugitive from justice, an unlawful user of controlled substances, adjudicated as mentally defective, dishonorably discharged from the military, or subject to a domestic violence restraining order, among others. Immigration status also matters: nonimmigrant visa holders (e.g., B-2 tourists, F-1 students) are generally prohibited from importing or possessing firearms or ammunition, with a narrow exception for those who hold a valid hunting license issued by a U.S. state.

Federal law sets the minimum purchase age at 18 for rifles and shotguns from licensed dealers, and 21 for handguns. However, private sales between individuals (often called the “gun show loophole”) are not federally regulated, leaving the rules entirely to states. As of 2025, the ATF has not mandated universal background checks for private transfers, though 19 states and Washington D.C. have enacted their own laws requiring them. The federal standard is the floor—states can and do impose stricter requirements.

The NICS Background Check System

Every purchase from a Federal Firearms Licensee (FFL) dealer triggers a NICS check. In 2023, the FBI processed 25.5 million checks, with approximately 1.2% resulting in a denial, according to the Bureau of Justice Statistics. The check is typically completed within minutes, but if no response is received within three business days, the dealer may proceed with the sale under the “default proceed” rule—a provision that has drawn controversy in mass shooting cases where the buyer should have been denied.

State-by-State Differences: Permitless Carry vs. May-Issue

The most significant divide among states is how they regulate the carrying of concealed firearms. Three main regimes exist: permitless (constitutional) carry, shall-issue, and may-issue. As of early 2025, 28 states have adopted permitless carry, meaning any adult who can legally possess a firearm may carry a concealed handgun without a permit. These include Texas (effective 2021), Florida (effective 2023), and Ohio (effective 2022). However, even in permitless states, specific locations such as schools, government buildings, and bars remain off-limits.

In contrast, may-issue states (California, New York, New Jersey, Maryland, Hawaii, Massachusetts, Connecticut, Delaware, and Rhode Island) require applicants to demonstrate “good cause” or a specific need for self-defense beyond general fear. The Supreme Court’s 2022 ruling in New York State Rifle & Pistol Association v. Bruen struck down New York’s may-issue standard, forcing the state to adopt a shall-issue system, but the state legislature responded with strict new licensing requirements, including character references and in-person interviews. New York’s current law, as of September 2024, requires 16 hours of in-person training and a live-fire qualification.

Open Carry Laws

Open carry—carrying a firearm visibly in a holster—is legal in 45 states, but with significant restrictions. In California, open carry is generally prohibited in incorporated cities. In Texas, open carry of handguns requires a License to Carry (LTC), while long guns may be carried openly without a license. In Florida, open carry of handguns was illegal until the 2023 permitless carry law, which now allows it under certain conditions. International visitors should note that open carry in a state where it is legal can still cause public alarm and police contact, especially if the individual does not speak fluent English.

Firearm Safety Training: What Courses Exist and Who Requires Them

Firearm safety training is not federally mandated, but 31 states and Washington D.C. require some form of training to obtain a concealed carry permit. The content and duration vary wildly. In California, the minimum is 8 hours of classroom instruction plus a live-fire qualification. In New York, as noted, 16 hours is required. In Texas, the LTC requires 4-6 hours of training including a proficiency demonstration. In permitless carry states, no training is legally required to carry, but voluntary courses are widely available.

The most recognized training standard is the NRA Basic Pistol Course, which typically runs 8-10 hours and covers safe handling, storage, and marksmanship. Other major providers include the U.S. Concealed Carry Association (USCCA) and state-specific programs offered by local law enforcement or private ranges. For international residents, some states (e.g., Florida) explicitly allow non-U.S. citizens with valid hunting licenses or state-issued IDs to apply for permits. As of 2024, the Florida Department of Agriculture and Consumer Services reported that approximately 1.2 million active concealed weapon licenses were held by non-residents and non-citizens combined.

Online vs. In-Person Training

Many states accept online-only training for the classroom portion, but live-fire qualification must be conducted in person with a certified instructor. For example, Utah’s concealed firearm permit (honored in 36 states via reciprocity) requires a four-hour in-person course that includes a live-fire component. Online courses alone will not satisfy the requirement. For travelers comparing options, some platforms like Trip.com flight & hotel compare can help budget for travel to a training facility in a neighboring state if local options are limited.

State-Specific Registration and Waiting Periods

While federal law does not require firearm registration, several states and localities maintain registries. California, New York, Hawaii, Massachusetts, and Washington D.C. require registration of handguns at the point of sale. California’s Department of Justice maintains a central database of all firearm purchases, including long guns since 2014. In contrast, states like Texas, Arizona, and Georgia prohibit any form of firearm registry by law.

Waiting periods are another key variable. As of 2025, nine states and D.C. impose a waiting period between purchase and delivery. California mandates a 10-day waiting period for all firearm purchases. Florida requires a three-day waiting period for handguns (waived for permit holders). Hawaii has a 14-day waiting period. No waiting period exists in 41 states, meaning a buyer can walk out of a store with a firearm on the same day after a successful NICS check.

The Effect on New Residents

New residents moving from a restrictive state to a permissive state (e.g., from California to Texas) face no legal barriers to owning firearms they already possess, provided those firearms are legal in the new state. However, moving in the opposite direction—from Texas to California—requires careful planning. California’s “safe handgun roster” bans the sale of new models not on the list, and many common handguns (e.g., certain Glock models) are not available for purchase. Importing a firearm that is not on the roster for personal use is generally allowed, but the firearm must be registered within 60 days of residency.

Magazine Capacity and “Assault Weapon” Bans

A growing number of states restrict magazine capacity and ban certain firearms classified as “assault weapons.” As of 2025, 14 states and D.C. limit magazine capacity to 10 rounds (California, New York, New Jersey, Hawaii, Maryland, Massachusetts, Connecticut, Rhode Island, Vermont, Colorado, Washington, Oregon, Illinois, and Delaware). California’s ban applies to detachable magazines over 10 rounds, and possession of a “large-capacity magazine” is a misdemeanor.

Assault weapon bans exist in 10 states, using varying definitions. California’s ban is the most comprehensive, covering specific models by name and features (pistol grip, folding stock, flash suppressor). New York’s SAFE Act bans all semiautomatic rifles with a detachable magazine and one “military-style feature.” Violations can be felonies. For international residents who may own firearms in their home country, it is critical to check these laws before moving—a legal hunting rifle in Canada could be an illegal assault weapon in New Jersey.

FAQ

Q1: Can a non-U.S. citizen on a student visa (F-1) buy a gun in the United States?

Generally, no. Federal law under 18 U.S.C. § 922(g)(5) prohibits nonimmigrant visa holders from possessing firearms or ammunition. The exception is if the individual holds a valid state-issued hunting license. As of 2025, approximately 15 states explicitly allow nonimmigrants with hunting licenses to purchase firearms from licensed dealers. However, the ATF advises that even with a hunting license, the buyer must still pass a NICS check and comply with all state laws. Permanent residents (green card holders) are treated as “non-immigrant aliens” for purposes of the exception but are not subject to the visa-holder prohibition.

Q2: What is the minimum age to buy a handgun in the United States?

Under federal law, licensed dealers cannot sell a handgun to anyone under 21. However, 19 states allow private sales of handguns to individuals aged 18-20. As of 2025, the federal age minimum for handgun purchases from FFLs has been upheld by multiple courts, including the 5th Circuit in NRA v. ATF (2024). For rifles and shotguns, the federal minimum age from dealers is 18. Some states (California, Florida, Hawaii, Illinois, Iowa, Maryland, New Jersey, New York, Washington) have raised the minimum age for all firearm purchases to 21, regardless of type.

Q3: How long does a concealed carry permit last, and can it be renewed?

Permit durations vary by state. The most common period is 5 years (e.g., Texas, Florida, Arizona). Some states offer longer terms: Utah issues 5-year permits, while Virginia issues 5-year permits for residents. Non-resident permits in states like Utah and Florida are valid for 5 years as well. Renewal typically requires a refresher course (often shorter than initial training) and a new background check. As of 2024, the average renewal fee across shall-issue states is $50-$100. Permitless carry states do not issue permits, so no renewal is needed.

References

• Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF) 2024, Federal Firearms Regulations Reference Guide
• FBI Criminal Justice Information Services (CJIS) 2024, NICS Operations Report 2023
• U.S. Government Accountability Office (GAO) 2024, Firearm Laws: State Permitless Carry and Background Check Requirements
• California Department of Justice 2024, Firearm Prohibiting Categories and Registration Data
• National Conference of State Legislatures (NCSL) 2025, Concealed Carry Permit Reciprocity and Training Requirements