Ever since braces became a thing, and certainly since ATF started flip-flopping, I have thought/said that if this debacle doesn't clearly illustrate the arbitrary and capricious nature of the NFA, nothing does. ATF could perhaps win the brace challenge iff they came in and said, "Yup, we were wrong in how we handled this." But nearly 300 pages of trying to justify what has gone on to this point tells me that won't happen. Pleeeease double down ATF.