Ultimately this ruling doesn’t challenge the notion that the ATF has the lawful mandate to regulate silencers. Neither does it say that the Stabilizer Brake isn’t a silencer. It simply states that if the ATF can’t prove that this device is a silencer, then the ATF can’t classify it as one.
Check it out:
“[The] ATF’s decision to classify the Stabilizer Brake as a ‘firearm silencer’ is ‘arbitrary and capricious’ for at least two reasons: the agency failed to ‘articulate a satisfactory explanation’ for its decision and the agency failed to ‘examine the relevant data’ before coming to a final conclusion. For these reasons, the agency action was ‘arbitrary and capricious,’ and must be set aside under the APA,” according to the United States District Court for the District of Columbia ruling against the ATF’s classification of the Innovator Enterprises Inc.
The Court found that the ATF did not provide an explanation for why it classified the Innovator Stabilizer Brake as a silencer and further slapped the company for not even bothering to check and see if the brake even decreased noise in the first place.
Backing up, what is the Stabilizer Brake? It’s a pretty complicated device, with two internal ported manifolds that redirect gas perpendicular to the bore encapsulated by two outer shells that direct the blast forward. At the end of the brake is a device that adds turbulence to the forward-expanding gasses, which we presume reduces increased felt recoil as a result of dumping the pressurized gas forward.