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"The part of the law that is relevant is that you are modifying the gun to fire more than one shot when the trigger is pulled." This is what the ATF originally said about bump stocks: “Since your device does not initiate an automatic firing cycle by a single function of the trigger,” Curtis said, “FTISB finds that it is NOT a machinegun under the [National Firearms Act], or the amended [Gun Control Act].” Unless you know more that the ATF’s Firearms Technology Industry Services Branch your conclusion is simply wrong.

They also ruled that G_Date FN FALs are machineguns. Then they didn't. They ruled that open bolt Mac 10 and KG-9s were NFA machine guns because they were easily converted to full auto. And yes I do know as much about the functioning of the AR15-M16 platform as the ATF. Now they will say that the use of a bump stock when attached to a AR type semiautomatic firearm can initiate an automatic firing cycle by the single function of the trigger. I understand that the simulated automatic fire is caused by the movement of the trigger being bumped by a stationary finger and is in reality very rapid semi-auto fire. It won't matter. It's like attaching an electric motor to a trigger crank. It substitutes the actual trigger for the auto sear.

Used to be you could legally posses all manner of parts and pieces, like M2 carbine kits as long as they were not installed in your M1. Not any more. You can add the bump stock to the list.

I fail to see how this isn’t an ex-post facto law,
something that is supposed to be unconstitutional.

Original lawful ownership is now made illegal...

Not only “shall not be infringed” but unconstitutional as well.