Its not hearsay El Caca. If you put it on with the intent to use it as a stock its an SBR.

If you build it as a pistol with the intent to use it as a pistol brace then its a pistol.

There are a bunch of people that decided because of the letter to Greenwood PD that it was an end around to an SBR which was incorrect and then they started doing you tube videos telling everyone to put it on their pistols with the intent of using it as a rifle.

I guess many people don't get the distinction of intent as it relates to criminal law. You can do nearly the same thing and in many cases your intent is what makes it criminal or not.

An example would be hitting a dog with a car. If its an accident its not a crime. But if you intentionally run over a dog its a crime. The action and result is the same its all in intent.