Because the operating theory is you’ll bring them home, where they’re illegal. Pretty SOP, a lot of gun shops even have signs saying they won’t sell to out of state residents because they don’t want to be involved in a sale where they know your intention is to break the law.
Sure, that’s the theory but this ass just made a blanket statement that said it is illegal for CA residents to buy this type of rifle out-of-state which is not true.