This is correct ^. The legislation as it is wrote specifically singled out Bullpup stocks and not bullpup designs as being prohibited devices. So if you have a conventional firearm that can be placed into a Bullpup stock, that stock is prohibited. But if you have a firearm that was clearly designed to be a Bullpup from the factory such as the KSG, RFB, RDB Tavor, T97, Fs2000 or PS90 for example, they do not use a stock and are integrally designed as bullpups.