Yes, you can buy ammo out of state under federal law. The interstate purchase restriction in 18 U.S.C. § 922(a)(3) covers firearms only, so walking into a shop in a neighboring state and buying rounds is not a federal offense.1Office of the Law Revision Counsel. 18 USC 922 – Unlawful Acts The complications come from state law on both ends of the trip: some states require a permit or background check before any ammunition sale, and your home state may ban certain ammunition types or magazine sizes no matter where you bought them.
What Federal Law Allows
The provision most people are thinking of, § 922(a)(3), makes it illegal to bring a firearm purchased in another state back home, with narrow exceptions. It says nothing about ammunition.1Office of the Law Revision Counsel. 18 USC 922 – Unlawful Acts For a non-prohibited adult, an out-of-state ammunition purchase is federally lawful.
Two federal limits still apply to every ammunition sale. Licensed dealers cannot sell handgun ammunition to anyone under 21, or rifle and shotgun ammunition to anyone under 18. And selling ammunition to a person the seller knows or reasonably suspects is prohibited from possessing it is a federal crime. Prohibited persons include people convicted of a felony, fugitives, unlawful drug users, and anyone subject to a qualifying domestic violence restraining order or convicted of a misdemeanor crime of domestic violence.1Office of the Law Revision Counsel. 18 USC 922 – Unlawful Acts
States That Can Stop the Sale
State law applies to any ammunition transaction inside that state’s borders, and out-of-state buyers get no exemption. A shop clerk who follows state rules will turn you away if you don’t meet them.
Permit and Background Check States
California runs an electronic eligibility check through a licensed ammunition vendor for every purchase. Illinois requires a valid Firearm Owner’s Identification Card, including on orders shipped from out-of-state sellers. Connecticut, Massachusetts, and New Jersey require a state-issued firearms identification card or permit, each of which is issued only after its own background check. If you travel to one of these states expecting to buy ammunition the way you would at home, expect to leave empty-handed.
Prohibited Ammunition Types
Federal law bars licensed manufacturers and importers from selling armor-piercing handgun ammunition outside a narrow set of government and export channels.1Office of the Law Revision Counsel. 18 USC 922 – Unlawful Acts Some states go further and restrict additional categories such as tracer or incendiary rounds. If you are buying anything beyond ordinary target or hunting ammunition, check the selling state’s rules before you go.
Getting It Home
Buying legally in another state does not mean you can legally possess what you bought once you cross back into your own. Your home state controls what sits in your closet.
The trap most travelers fall into is magazine capacity. Roughly a dozen states cap magazine capacity, most at 10 rounds and a few at 15.2Congressional Sportsmen’s Foundation. Standard Capacity Magazines A 30-round magazine bought legally in one state becomes contraband the moment you drive it into a 10-round state. Depending on the jurisdiction, that’s a misdemeanor or a felony.
Some states also regulate the importation of ammunition itself. Illinois residents ordering from out of state by mail or carrier must provide a copy of their Firearm Owner’s Identification Card, and the shipment can only go to the address on the card or a matching state ID. If your state has any ammunition-specific permit or registration, assume it reaches ammunition you bring in from elsewhere.
Ordering Online Instead
There is no federal requirement that ammunition ordered online ship through a licensed dealer. That requirement exists for firearms. In most states, ammunition can ship directly to your door via a private carrier.
The exceptions track the same states that regulate in-person sales. California and New York require online ammunition shipments to route through a licensed dealer. Connecticut, Massachusetts, and New Jersey effectively require the same result through their permit and ID systems. Elsewhere, direct-to-door shipping is generally permitted for buyers who meet the federal age minimums.
One universal rule: ammunition cannot be shipped through the U.S. Postal Service. USPS classifies small arms ammunition as prohibited material, and mailing it can bring civil penalties and criminal charges.3United States Postal Inspection Service. Prohibited, Restricted, and Non-Mailable Items – Section: Ammunition UPS and FedEx will move ammunition by ground under their own hazmat policies.4USPS. Shipping Restrictions and HAZMAT – What Can You Send in the Mail Reputable online retailers usually screen shipping addresses against state restrictions, but not all do, and the legal responsibility ends with you.
Driving Through a Restrictive State
If your route home crosses a state with tight ammunition or magazine laws, the Firearm Owners’ Protection Act offers a limited shield. Under 18 U.S.C. § 926A, a person not otherwise prohibited from possessing firearms may transport a firearm and ammunition through any state, regardless of that state’s law, as long as both are legal at the origin and the destination.5Office of the Law Revision Counsel. 18 USC 926A – Interstate Transportation of Firearms
The conditions are strict. Neither the firearm nor the ammunition may be readily accessible from the passenger compartment. In a vehicle without a separate trunk, both must be in a locked container other than the glove compartment or center console.5Office of the Law Revision Counsel. 18 USC 926A – Interstate Transportation of Firearms The protection is meant for pass-through travel; stopping in the restrictive state for reasons beyond brief travel breaks has led some courts to reject the safe-passage defense. And on the ground, a trooper unfamiliar with § 926A may arrest first, leaving you to sort it out later.
The statute also references transporting “a firearm” alongside ammunition. If you are moving ammunition alone through a restrictive state, the safe-passage argument is weaker.
Penalties for Getting It Wrong
A prohibited person who ships or receives ammunition in interstate commerce faces up to 10 years in federal prison. The same maximum applies to anyone who transports ammunition across state lines intending it to be used in a felony, or knowing it will be.6Office of the Law Revision Counsel. 18 USC 924 – Penalties Unlawful importation into the country carries up to five years.
State charges layer on top. Possessing ammunition without a required state permit, bringing in a banned ammunition type, or possessing an over-capacity magazine can produce anything from a fine to a felony sentence depending on the state. The most common trouble spot is the gap between federal safe-passage protection and aggressive state enforcement of possession laws.
What to Check Before You Buy
Two questions decide the trip. First: does the state where you plan to buy require a permit, background check, or dealer-only transaction? Second: does anything you plan to bring home, whether ammunition type, quantity, or magazine capacity, run afoul of your home state’s law? If the answer to either is yes, comply with the specific requirement or don’t make the purchase. Federal permission does not override either state’s rules.
For online orders, confirm your state allows direct shipping before you check out. For driving trips through restrictive states, keep ammunition and any firearm locked away from the passenger compartment, and avoid stops that go beyond fuel, food, and rest.