Suppressors SiCo muzzle loader

[Whiskey Tango Foxtrot]

Seen one in gun shop a few years ago and was amazed no stamp required. Are they still non NFA?
Or did they close that loop hole?

SilencerCo Maxim 50 Suppressed Muzzleloader: No NFA Tax or Wait, 50-State Legal - The Truth About Guns

New from SilencerCo: a 50-state legal suppressed rifle! Furthermore, there’s no NFA wait time or tax and, in most cases, the Maxim 50 muzzleloader can be ordered online here and shipped right to your door. More info and photos from SilencerCo follow: For the first time since the National...

www.thetruthaboutguns.com

 

[Charger442]

Seen one in gun shop a few years ago and was amazed no stamp required. Are they still non NFA?
Or did they close that loop hole?

SilencerCo Maxim 50 Suppressed Muzzleloader: No NFA Tax or Wait, 50-State Legal - The Truth About Guns

New from SilencerCo: a 50-state legal suppressed rifle! Furthermore, there’s no NFA wait time or tax and, in most cases, the Maxim 50 muzzleloader can be ordered online here and shipped right to your door. More info and photos from SilencerCo follow: For the first time since the National...

www.thetruthaboutguns.com

Black powder isn't even considered a firearm. So if it's permanently attached to the barrel, it's not considered a suppressor either.