You don’t
I’ve backed up my statements with two conversations today with the ATF. Both without hesitation said it’s a lower and the owner can build it , disassemble it and build it again going from rifle to pistol etc… I encourage you to do the same and talk with the ATF as no one else so far has seemed to do. If you get a different answer than I received I would greatly appreciate the name and number so I can put them in touch with my agents and let them hash this out.
Thanks and good luck.
Thank you.