Scott7891
Love those Combloc guns
However, you would likely be making a banned Assault Long Gun if all you did was leave it in a sporter config and make is accept standard mags. It wouldn't be importable in that configuration.
It would be illegal since the ability to take greater than 10 rounds are illegal on imported rifles. That in turn would make it a banned Maryland gun if it could take more.
The Arsenal SA-93 they mentioned on the list is now considered a banned weapon because the import standards changed two years after the bulletin was written. It is banned not only by name but also because it can take standard magazines greater than 10 rounds.