Got the Notice for Arm Brace comments yesterday from BATFE. https://www.federalregister.gov/documents/2020/12/18/2020-27857/objective-factors-for-classifying-weapons-with-stabilizing-braces#addresses "...this notice previews ATF's and the Department of Justice's plan to subsequently implement a separate process for current possessors of stabilizer-equipped firearms to choose to register such firearms in compliance with the NFA, including an expedited application process and the retroactive exemption of such firearms from the collection of NFA taxes."