I believe all newly manufactured NFA itmes are registered on a BATFE Form 1.
This stuff is why I settle for paying $200 on an ATF form 1 for each silencer I make. If you are making a few as a hobby, then using the ATF from 1 and paying the $200 tax on each is a better way to go in my opinion
I read that the USAS-12 was a title 2 gun, but did not know that it could be registered on a form1 without the sheriff's signature.