northern1,
I was one of the guys who got scammed by the guy selling the RD7 on knifeforums. I paid with a Money Order. I put a stop payment on the Money Order, and in 60 days, I will find out if the scammer cashed it. If so, that is Mail Fraud, a federal offense. If you bought the item in question with a Postal Money Order, this is something to consider. It really sucks that there are people out there that pull this crap. I have had countless transactions over the years on BF, KF and AR15.com and this is the first time this has happened.
Feel free to PM me if you have any other questions. I was able, through a little digging, to contact my scammer by phone. Maybe you can do the same.