Aman is delusional as usual. Banning one specific bullet just means they will have to use a different one, the horror!
It looks to me like the entire caliber is being banned. Which would have the effect of banning the weapon that uses the caliber.
And it's really stupid to do it that way, for one, just on principle.
For two, especially since that type of firearm isn't very prevelant in gun violence, it's not going help a god damn thing in practice.
It's partisan bandstanding to drum up support among the party-line fools.