NRA and CRPA(California Rifle and Pistol Association) filed a lawsuit challenging California's Assault Weapons Control Act (AWCA). This lawsuit is in response to law signed in by Governor Jerry Brown in 2016. It also challenges 4 other laws in California including 10 round ban.
Here is the filing provided by Michell & Associates
http://michellawyers.com/wp-content/uploads/2017/04/Rupp-v.-Becerra_Filed-4-24-17_Complaint.pdf