SEKCobra created an SVN which every time when a new Team Fortress 2 Update comes out, includes all new Weapon Models.
PICS:
SVN:
The SVN link is to be checked-out on the new created folder "garrysmod/addons/tf2unlocks"
http://tf2unlocks.googlecode.com/svn/trunk/tf2unlocks
You need to delete the file "garrysmod/settings/spawnlist/team fortress 2.txt"