Try Del-Ton Inc.
http://www.del-ton.com/SearchResult.aspx?CategoryID=61
Tony at Del-Ton put together avery nice upper for me. It is based on a 16" "post ban" stainless steel barrel from Olympic Arm (note Olympic Arms barels are really Wilson barrels.
Mine shoots very well, thank you! :)
He also has other barrels available.
If I remember correctly, there was a post on this site complaining about Model-1. It seems that they were trying to pass off some 1:10 barrels as 1:8 twist.