My dad is a truck driver, and drives along the US-Mexico border through Texas, New Mexico, Arizona, and California. It is getting more and more dangerous to be near the border, and he wants to start bringing his 12 gauge pump shotgun with pistol grip, no stock. My main question is, is it even legal to have in California with their absurd "assault weapons" laws? I have looked around, and cant find any info on shotguns, only rifles and handguns. Is there any other legal issues he could run into keeping the shotgun in his truck? He would like to keep it loaded when he is stopped somewhere sleeping, but most of the time it would be unloaded and shells will be locked up. I know it cannot be loaded in California, but what about the other states? Any other advice, other than stay away from the border?