Proposition 63 would require a background check and Department of Justice authorization to purchase ammunition. It would prohibit possession of large-capacity ammunition magazines, establish procedures for enforcing laws prohibiting firearm possession by specified persons and require Department of Justice's participation in the federal National Instant Criminal Background Check System.
A yes vote on this measure means: A new court process would be created for the removal of firearms from individuals upon conviction of certain crimes. New requirements related to the selling or purchasing of ammunition would be implemented.
A no vote on this measure means: No new firearm– or ammunition–related requirements would be implemented.
The full text of the measure is available here. Information in this article is from the California Secretary of State.