If you have a C&L FFL in California by law you still need a COE (Certificate of Eligibility) from the California Department of Justice to buy & sell ammunition, and you are suppose to keep records of the sales on who you sold. (I have been told by a few Californians that California is not enforcing the new laws, as they are so confusing. But I still am only shipping to an FFL with a COE, as I find nothing in writing on that subject.)
I like the F.O.I.D. system (Firearms Ordnance I.D.) use in IL, MA, CT, NJ better. You just go to the local police, they do a back ground check and issue a card. Then if you want ammunition you just e-mail a picture of the card to you supplier and they can ship you. This helps the sell sell only the honest people hopefully. Of coarse no law stops the bad people from doing anything bad at least once .
In Maine, under Maine law (if you don’t have a FFL dealership) you can sell a firearm or ammunition to anyone else living in Maine (in person) without a back ground check. This has caused a lot of issues, but still, there are more guns per person in Maine then any other state, and still we are the lowest crime state in the country. I wonder why :-)