In the shadow of the San Bernardino massacre where two assailants armed with more than 1,600 rounds of bullets killed 14 people and wounded 21, California advocates have a plan brewing to regulate the sale of ammunition.

Gun control advocates led by California lieutenant governor Gavin Newsom recently introduced a ballot initiative that would ban possession of high-capacity magazines, and govern ammunition sales in the state similar to the way gun sales are currently handled by requiring background checks and permits for purchase.

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"Currently if I want to buy cold medicine, I have to go to the store and show my ID," said Ari Frielich, staff attorney for San Francisco-based Law Center to Prevent Gun Violence, which helped to write the initiative. "But I can have ammunition shipped to my door as if it was pizza ... Ammunition is a deadly instrument and it's time we treated it as such."