What?, new federal laws now, "according to Remington"?
Brian, I don't fault you for this error however whoever made that decision is in error. The part of the gun that is a "firearm" is the reciever, not the barrel. For that reason a Huntsman or a Huntsman reciever (a new one with a regular firing pin, not the old style early Huntsman reciever with a flat style firing pin that cannot ignite standard firearm primers) is by law a firearm. That is because it can be fitted with a rifle or shotgun barrel.
For the same reasoning and laws, a Sidekick reciever or the old flat firing pin style Huntsman reciever is not a firearm, since it cannot be fitted with a shotgun or rifle barrel. Those styles can ONLY be fitted with a ML barrel, therefore they are not firearms.
It is really Very simple, only an uninformed corporate attorney could foul up those simple facts and laws. The reciever makes it a firearm, not the form #4473.
Merry CHRISTmas....<><....