When you purchase a rifle online, they aren't supposed to send it to you directly. Generally what happens is the seller sends the gun to a local dealer, who gets a small commission on the sale and by law is required to hold the weapon for a few days and do a background check with the FBI. Once that clears, you are able to go and pick it up. Obviously this was all a mistake, but Amazon clearly messed up and could face legal ramifications for what they did. The kid will more than likely be required to send the gun back to Amazon. Contrary to popular belief, it's really not that easy to purchase a firearm in the US of A.