Bro......come on did you even read my postI thought it was legal. See ATF letter below.
http://www.thetruthaboutguns.com/20...istol-equipped-with-an-sb-tactical-arm-brace/
https://cdn0.thetruthaboutguns.com/...es-Stabilizing-Brace-Letter-Final-3.21.17.pdf
"Therefore, an NFA firearm has not necessarily been made when the device is not re-configured for use as a shoulder stock — even if the attached firearm happens to be fired from the shoulder."