Yes, I told you. See Cats, Guns, and National Security: A word about the pistol braces matter. (catsgunsandnationalsecurity.blogspot.com)
1. This is a result of the Election Steal. The rule (later rescinded) under the Trump Administration was a genuine attempt to outline the difference between a brace and a stock.
2. Pistols conceptually don't generally have "wrist-rocket"-type braces, and ESPECIALLY not ones clearly intended to be used from the shoulder. (One company, SB Tactical, actually used the word "stock" in their promotional material--see TDF 63.)
3. The 2A community got so arrogant in showing off their shoulder use of these things that they got slapped. See HERE and TDF 63 -- the need to engage and not be greedy.
ARTICLE: ATF Released New Proposed Pistol Brace Rules (ammoland.com)
1. Honestly, a true "wrist rocket"-type brace with no real chance of being braced against the shoulder--that is, an item with the professed intent of the "pistol brace"--might still pass muster.
2. The article seems to say the generic "firearm" category is being restricted, and says the Mossberg Shockwave and TAC-14 will be SBSs (Short-Barrel Shotguns). No specific reference to the Henry Axe, but I warned people: TDF 43/44, and TDF 71 for brief reference -- SBS laws arguably constitutional and certain to be upheld under Heller.
3. Some possible mitigations are suggested in the ATF'nE issuance, such as grandfathering and forgiveness of tax for SBR registration. ENGAGE, and these can be done. TDF 63.
CGNS/TDF CONSTITUTIONALITY EVALUATION: SBRs should probably be protected (per factual elements of the 1942 Cases decision stemming from Miller), but under Heller will not be. The tactical role of SBRs can be fulfilled by non-NFA pistol-caliber carbines, however. See TDF 17 and TDF 71.
See also TDF 47.
I WARNED PEOPLE.
TDF INDEX: Cats, Guns, and National Security: THE DAILY FUDD index. https://catsgunsandnationalsecurity.blogspot.com/2021/03/the-daily-fudd-index.html