The bill is blatantly unconstitutional under recent Supreme Court precedent and would be immediately challenged in Federal court as such.
Under the proposed language, the standard extended BX-25 magazine used in a Ruger 10/22 (.22 caliber) rifle would be illegal, along with those of hundreds of other commonly owned and used firearms. And the guns themselves would also be illegal, as it appears from the bill's original language.
Even California didn't try to go that far.