Can barrels and stocks for traditional sidelock muzzleloaders be purchased directly from Thompson Center? I know that there used to be a company called Fox Ridge outfitters that carried barrels but I can't find a webpage for them anymore.

Mossie; Here is the # for Fox Ridge Outfitters. They are in New Hampshire, I think next door to TC. They are TC's Custom shop,I think Phone 603-335-2999 Good Luck

Fox Ridge web sight is temporarly down for reorganization, you can reach them by phone at the number Thumper posted above. You can also get some excellant barrels to fit the traditionals from GreenMountain and stock blanks from a number of places.
http://www.gmriflebarrel.com/
http://www.thehawkenshop.com/hawkenshop.asp
http://riflestocks.tripod.com/links.html
http://www.octobercountry.com/index.php
http://www.longrifles-pr.com/
some do not list all they have available and you have to contact them for some items. Lee