Yes, large-capacity gun magazines are legal in the United States. There is no federal law that prohibits the manufacture, sale, or possession of large-capacity gun magazines. Some states do have laws that regulate or prohibit the use of large-capacity gun magazines. For example, California prohibits the use of large-capacity gun magazines capable of holding more than 10 rounds of ammunition. Some local jurisdictions have enacted regulations on large-capacity gun magazines. For example, New York City prohibits the possession of any firearm magazine that can hold more than five rounds of ammunition. In addition to state and local regulations, there may also be some restrictions imposed by firearms manufacturers or retailers.
Possessing a large-capacity gun magazine is not generally illegal under federal law. There are, however, some exceptions. For example, it is a federal crime to possess a large-capacity gun magazine if the person possessing the magazine is also in possession of a firearm that is prohibited by federal law. Additionally, it is a federal crime to possess a large-capacity gun magazine if the person possessing the magazine has been convicted of a felony.
It is important to note that large-capacity gun magazines are not regulated by the National Firearms Act (NFA). The NFA is a federal law that regulates certain types of firearms, including machine guns and sawed-off shotguns. Large-capacity gun magazines are not considered to be firearms under the NFA.