My co worker was recently arrested in the central valley and these were two of the eight felony charges
PC 12031 is possession of a loaded firearm. Subdivision (c) is an exception to the prohibition on carrying loaded firearms that applies to certain people. Your co-worker was most likely charged with 12031(a) as opposed to 12031(c). PC 12316(b) prohibits certain types of people who aren't allowed to own/possess firearms from owing/possessing/controlling ammunition.