You do not need a link if you have the brains to do a google search
Everyone needs a link to the claim that those currently owning bumpstocks would be required to surrender them.
That is not how law works,
No, what I wrote was that a link is needed because it is so controversial.
And it is not a link to the fact the BATF wants to make bumpstocks illegal.
It is whether the BATF is going to try to make them illegal retroactively.
The BATF can easily make them illegal, but the BATF can never legally make them illegal retroactively.
That is strictly in violation of the ex post facto law in the US.