Assult Rifle Zero BlOom? Plz respond

In the december playlist update they said the Zero Bloom secondary weapon will be switched to the assult rifle. What exactly does that mean?

They meant that in Zero Bloom gametypes that the Assualt Rifle would be replacing the Magnum as a secondary weapon on spawn. The Assault Rifle still has bloom.

Something i should note: On some maps like Powerhouse, you can still find spare Magnums lying around :P.