Ok, a gun on gunbroker.com, internet auction. represented and in e-mails sent expressly to you, mis stated facts. Check your state's, Long Arm Statute. If a misrepresentation communicated to your e-mail, induced you to bid and purchase, you have them in a form of commercial misrepresentation. Your state may have a cosumer protection law which permits triple damages. You need to do some research for that. Then, check and see how many deals the seller has had in interstate commerce and whether they regularly ship to your state. I'd sue that bugger's in small claims court for every dime and court costs. You will have to look up the proper legal entity of the seller and if a corp, it's resident agent for service of the papers. In Maryland small claims court, it would cost around $30.00 to sue, with certified mail service. They will have to come to your state to defend, which they probably won't. Then get a copy of the judgment, under "triple seal" the clerk will know what this means, and pay to file the judgement in the property records of Florida county where the seller is. You won't believe how much that can mess up their credit and prevent future loans. They will then have to hire a lawyer to ty to prove the judgment was rendered without jurisdiction in your state. It will cost them at least five hundred dollars. You may be out a few more dollars, but it will cost them plenty times what you are out. I recently sued an internet seller in Maryland over $22.00 on merchandise that wasn't delivered. (I paid extra for insurance which the buyer didn't purchase but kept the money for.) Got a judgment for treble damages and costs. I filed that in Kansas in the property records and suddenly a few months later the seller was trying to refi his house and my judgment "queered" his refi. He paid up right quick.
If you don't stand up to these internet bullies, they won't learn any leson.