Don’t they usually use 9mm Luger like a pistol?
I think so, though they’re chambered for several other rounds like .45 ACP.
9mm Parabellum, yes. The Uzi is also available in .45 ACP. The .44 magnum revolver cartridge is considerably more powerful than either.
My question to the the sponsor of this is, is there a problem needing legislation? When was the last time this sort of body armor was used in a crime? The North Hollywood shootout was more than 15 years ago.
Of course the 9mm Uzi has nowhere near the penetration of a .44 magnum or similar round. You know it, I know it, but idiots like "Jazz" don't even know which direction to load a round into a magazine.