You had said there were four different constructions of Vanguard stocks and I was asking, since I don't know, whether you meant that there are multiple constructions of the synthetic stock. Not trying to be argumentative, just trying to learn...
[ol][*]Basic Vanguard synthetic injection moulded stock[*]Walnut Stock[*]Laminated Bell and Carlson stock on the SUBMOA[*]Laminated Hardwood stock[/ol]
Those are the 4 different stocks they can be sold with