Yes, you can purchase a gun magazine in another state so long as the sale is conducted in compliance with federal, state, and local laws. For instance, if you live in Virginia and purchase a gun magazine from a dealer in Pennsylvania, the transaction must comply with the Gun Control Act of 1968. This means that the dealer must have a valid federal firearms license (FFL) and that you must be 21 years of age or older. The dealer will also need to run a background check on you before completing the sale.
It’s important to note that some states have laws prohibiting the sale of certain types of gun magazines. For example, California prohibits the sale of magazines that hold more than 10 rounds of ammunition. So, if you’re planning to purchase a gun magazine in another state, be sure to check the laws of both states to ensure that the sale is legal.