I seem to remember seeing a transferable mini uzi sell on GB for ~15K about 8 months ago. I believe it was a Vector conversion. I try to keep an eye out on GB for MG sales just for the purposes of gauging the market. In February, I saw a no letter Action Arms Mini Uzi SMG postie sell for $9,525. Now what's interesting, is this gun was an Action Arms import apparently from the collection of the the president of US Uzi sales. It was in closed bolt configuration, which is especially rare. It was stamped MINI UZI 9mm PARA MU SN:50111 on the left side. Underneath it had the Action Arms import mark. Without any baseline for what these typically go for, it seemed like a great price for what it is. Don't know how much that helps, but you don't see them very often, so hard to say what they're "worth". Probably whatever someone is willing to pay at the time.