One of the members had that set for sale here, at AR15.coms Equipment Exchange about six months ago. He had a hell of a time selling it for some reason, and I think he ended up getting about $1800. I remember seeing this all happen after the fact. If I had been on the ball, I'd of paid that plus more!
If you're into selling, I'm into collecting Colts. I've had the R6550 in Z-Coat, but it was fired, so I got rid of it. Probably shouldn't have, and wouldn't today, but did. Email me if you're interested.