Only certain FFLs can sell NFA devices. They're called "Class III" dealers because they have to pay a class 3 special occupational tax for the privilege of dealing in NFA devices. So some shooters (mistakenly) refer to them as "Class III weapons." The SOT is a business tax and Class III has absolutely nothing to do with the weapon (or suppressor), and the end user doesn't directly pay any part of that tax when he buys the device (other than the profit from the sale helps the dealer pay for all of his business overhead in general).
So you'll be looking for a Class III dealer but what you buy from him is not a Class III device. There are no Class III devices.
And oh by the way, in the eyes of the ATF a suppressor is a firearm, even when there's no gun attached to it. Which gives you keen insight into the mindless arbitrariness of the ATF. And it's the same with certain gun parts. The part of a gun that the serial number is affixed to is generally considered (by ATF) to be a firearm, even if it isn't built into a functional gun.




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