I read the suit and the supporting documents. Stephen Halbrook takes BATF to task, using their own statements, previous rulings and even their previous testimony in another case. Yet BATF still insists that it's a MG because it supposedly fires multiple rounds with "a single function of the trigger".
Which is total bull pucky.
Bill Akins commented on this on the California Calguns site about how the gun operates. I think the issue could be resolved fairly easily with a short demonstration.
Said demonstration would require drilling a hole in the stock unit, behind the trigger-finger stops to allow a rod or nail to be inserted during firing. By inserting a rod when the trigger is rearward and interrupting the trigger operation it would show that the trigger is
physically disconnected from the shooter's finger. Thus, the mechanism is NOT firing multiple shots with a single trigger movement. (Alternatively a light/photocell could be used to count the number of times the trigger pulls away from the finger.)
I do hope Akins prevails over the BATmen in this case. He found a specific definition in the law and engineered a
legal method to speed up a semi-auto firearm's operation without turning it into a true machinegun.
For those not familiar with his stock design, here's an animated GIF file that shows how it works.