Ok... CLARIFICATION-
So people under 28 or 31 as of 2010 could reasonably be presumed to be in possession of illegal magazines for firearms they could not even own at the time of the ban.
It is 100% legal to possess hi cap mags in CA, regardless of age. There is no law banning possession, and it is up to a prosecutor to prove that you obtained them illegally. It is not up to the person involved to "prove" that they don't.
As I understand CA law, it is not legal to buy magazine bodies, which as I understand, define the magazine. It may be legal to replace previously owned but damaged magazine bodies, but to simply purchase a mag body and other mag parts to manufacture a >10 round magazine won't pass muster. I can buy all the floorplates, springs and followers I want for the high cap mags I own, but mag bodies are another animal.
Not correct. It is 100% legal to purchase mag bodies if that's what you want to do. You can purchase a complete magazine repair kit containing EVERY part of the magazine and not break any laws.
It is, however, illegal to use those parts to manufacture a new "hi capacity magazine."
So let me ask you this.
Can California customers legally purchase these magazine bodies (or similar products from other companies) from CProducts?
Flat out, no "ifs, ands, or buts". Is it legal?
I'm assuming its illegal for anyone who wasn't at least 18 in 2000 to buy any large capacity magazine parts. (because the whole idea is that your replacing your old worn out pre-ban mags, right?)
It is legal with "no ifs, ands, or buts." Age doesn't matter. Everybody keeps hammering on age, but there was NO AGE RESTRICTION to purchase magazines so anybody of any age could have purchased them. There are also ways people could have obtained them that don't fall within the "give, lend, sell, offer for sale, manufacture or import" restrictions in CA law.
Notice that "purchase" is not in there? What about somebody who leaves their mags at the range and somebody else that picks them up? "Find" is not in there as well. How about the person that has a parent die and takes possession of their hicap mags? There is nothing in CA law that would make them a criminal, and if there is no executor who made the mags change ownership who committed a crime? How about those people who are 18 years old right now and purchasing complete magazine parts kits to make 10/20 or 10/30 magazines? I have customers who buy 100's of hicap magazine repair kits at a time for conversion to 10rd capacity and resale at places like gun shows in CA.
There are also certain groups that can legally purchase hicaps... LEO, FFL's, armored car security officers. There are actually groups of people (such as FFL's) that could, theoretically, sell hicap mags in CA as they're "exempted" from the law. FFL's in CA are EXEMPTED from the "sell" portion of the law (12071), so technically they could sell hi-cap mags to private parties. I don't know of any that would, because the DOJ is the entity that renews their licenses, and the CA DOJ is well-known for jackbooted thuggery regardless of legality.
Edit- to the OP... according to the law it doesn't appear that you would be breaking the law by sending hicaps into CA. You would be the "exporter" from your state, not the "importer" into CA. The person receiving the magazine would be breaking the "import" portion of the law, however, and if the DOJ could prove you knew about that they may be able to find a conspiracy code that's applicable.