[mcguyver]

Bullpup stocks are a named prohibited item under the CCC. The working definition of what that means is a stock that added to an already functioning gun. To determine legality, the instance if the Walther G22 comes to mind. It is functional with the stock removed, therefore the stock (and in this instance the entire gun) is prohibited.

Now, that being said, the airsoft version of the G22 does not appear to be prohibited like the real one is.

You are definately in a grey area, and the choice of stock is the key. If it is a real stock, definately prohibited, no question. If it is an airsoft stock, most probably OK.