Alexander, no Sir. Only for sworn law enforcement officers with official Dept. letterhead. Details under Exemptions here : budsgunshop.com/feeds/state_reg/california_restrictions.pdf

Alexander, yes, High capacity magazines can be purchased, however they must be shipped to an FFL.
Credentials need to be on file prior to shipment. (Law enforcement officers with official Dept. letterhead is for non-compliant ARs and so-called “assault pistols” as long as the firearm is being used for duty use only.) budsgunshop.com/feeds/state_reg/california_restrictions.pdf ....You can always verify with Bud's at 1-859-368-0371 9am-9pm EST Mon-Fri. or use the Blue Chat now button at the bottom right corner 9am to 9pm Mon - Sat and 9am to 7pm Sunday. I have found the blue chat button works best.