So, according to the CA code that Salmonella posted, it boils down to this: you can't have a weapon with a removable magazine, a fixed magazine that holds over 9 rounds, or a weapon shorter than 30".

Hell, you can have a pistol grip, a thumbhole stock, a folding or telescoping stock, and a flash suppressor. You just can't have one of those and a removable magazine on the same weapon. So why's the removable magazine so damned important to you? Or one that holds more than 9 rounds? Too lazy to reload? Afraid the targets are gonna run away? Can't afford a bigger rifle rack for your hoopdee?
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Tent makers for Christie, 2016.