Sam1911
Moderator Emeritus
Exactly, which is what I was saying before. If you are making a "Firearm" under the definitions of Title II of the NFA (Silencer, SBR, SBS, AOW, destructive device, Machine Gun...theoretically ) then you have to mark it per that section of the code.it is required when you make an sbr/silencer on a form 1
If you're making a "Title I" firearm (as covered by GCA'68), then there is no law that says you must do so.