There's a reason why ordering a firearm requires an (out of CA) FFL to (CA) FFL transfer.
The CA FFL will determine if it makes the list or not. Usually the CA FFL will stop the non approved purchase before any monetary transactions have happened.
The only way to obtain a weapon that is not approved is to purchase it from an LEO. Got this information from the DOJ on a certain firearm that was delivered to CA that wasn't on the approved list.
Hope this helps.