What happens then is that the overseas check bounces after several weeks, long after the sellers check has been deposited in their scammers bank account. Since they are overseas there isn't much recourse to get the money back. An example would be like this, Joe Blow has a TX200 for sale for $500, Scammer Bob wants to buy it and asks Joe to accept a check from a thirdparty for $6000. Scammer Bob wants Joe to deposit the check in Joes bank account and then send him a $5500 check along with the gun. Joe does this and sends his TX200 and check to the gun overseas. Then Scammers Bob's check bounces after a few weeks and Joe is now out the rifle and the $5500, which also caused his checking account to be overdrawn.

Don't fall for this scam, this has been going on for many years in many forms. I remember 60 minutes doing a report on a form of this scam years ago prior to the internet revolution.

Don't accept any payment over the amount for the product being sold and it would be my recommendation to not sell anything to anyone overseas, save some of the European countries. Be very cautious and if you are contacted by one of these people, forward it to the appropriate law enforcement agencies.