In a recent conn case the atf measured everything that didn't fold with the braces extended similar to how they currently measure a rifle with a stock. Anything that folded with the Law Tac., got measured with it in the folded position and that is where the Conn shop dipped their toes in the water as they had vfg's attached. Charged with nondocumented AOW's instead of them being considered "firearms" as it being folded didn't meet the 26" length minimum.
So a pistol with brace that is 26" or > when a vfg is attached transforms into a "firearm", remove the vfg and it becomes a pistol once again. If when in "firearm" form with vfg it cannot be concealed or it becomes an AOW.
Current method of ATF measuring with a brace is to measure with brace extended without muzzle device unless it is pin/welded, if it has a Law Tac on it then it is measured when folded. Of course the ATF could change this method at anytime but currently this is how they took one shop down the rat hole.
Above is on the federal level, know your state laws as they may differ, such as TN or MI which have certain restrictions.
So a pistol with brace that is 26" or > when a vfg is attached transforms into a "firearm", remove the vfg and it becomes a pistol once again. If when in "firearm" form with vfg it cannot be concealed or it becomes an AOW.
Current method of ATF measuring with a brace is to measure with brace extended without muzzle device unless it is pin/welded, if it has a Law Tac on it then it is measured when folded. Of course the ATF could change this method at anytime but currently this is how they took one shop down the rat hole.
Above is on the federal level, know your state laws as they may differ, such as TN or MI which have certain restrictions.