Sent a check to private party for a sale of firearm to be shipped check was cashed and firearm not sent?

I sent a check for a private party sale of firearm to a person out of town. Upon receiving the check the person was supposed to have the firearm packed and then ship it thur a licensed dealer in his town. Check was cashed and when cashed the firearm was supposed to be shipped to my grandson thru the dealer. Nothing was taken to be shipped and no response from seller to phone calls or emails so the seller has the money and seems to have disappeared. I checked his address and he really lives where the check was sent but it seems I am out the 800.00 and wonder what can be done on my end. It was a regular checking account check that I wrote, and cashed thru the bank where my account is. So the person has the money, and I have no response to any of my attempted contacts. There is a 350 mile separation of where we both live, and I did the sale on trust as I was emailed pictures of the firearm, agreed to the sale and told him I would send a check and when it cleared he agreed to take the firearm to a dealer to have it shipped out. He even went so far as to give me the dealer contact persons name and business name of the place that was to ship out the firearm. It was never taken there to be sent off after the check was cashed and I was wondering if there is anything I can do, or am I left holding the bag. I feel stupid in trusting someone, and having them take me for the money and then stop communicating. This should have been brought to the shipper and sent out afterwards. Any help would be appreciated.Thanks