All the major shippers accept air guns, and they do not classify them as firearms, which is the correct interpretation under federal law. There are a couple of potential issues. Privately owned UPS stores operate under different guidelines, having nothing to do with federal law. Their rules do not allow the acceptance of air guns (I saw this), and they will likely refer you to their local UPS hub for shipping. That doesn't mean your local UPS store will not accept an air rifle, but they might not, and with good reason under their franchise rules. The other potential sticking point, simply an employee who doesn't understand the rules, which can lead to a frustrating delay. The main problem I see in lying about the contents, is in the event of loss or damage. I'm not sure what the effect of misrepresentation might have on such a claim, but it would probably not be favorable. I usually do not buy insurance, but I know most folks probably do, so it might be an issue.