Here's a reminder from the Gun Rights Coalition:
"If I-1639 passes: To buy a semi-automatic rifle, you will be required to take a safety class, then pass a background check with permission to obtain your medical records, pay both the background check fee and an additional $25 tax which is subject to increases, then wait ten days to obtain your rifle. Following this at least once each year you will subjected to another background check including obtaining your medical records and every five years you will be required to take another gun safety class. If you fail to do this then your rifle will be taken away. This assumes you are over 21 since they feel that you are responsible enough at 18 to carry a weapon in a war but that you can't own a rifle for self defense in your own home."