if your mom is now an NV resident, it is now federal felony for her to personally give you a firearm for you to take back to CA. it is a second federal felony for you to acquire a firearm outside of your home state and bring it back home. Your mom must deliver the firearm to a CA FFL for you to do the DROS and 10 day wait. There is no intrafamily exemption to this federal interstate transfer law.
That CADOJ form does not exempt you from federal law.
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No posts of mine are to be construed as legal advice, which can only be given by a lawyer.