PC means Penal Code. There is no such section of the penal code. The closest sections are 21810 and 21890 which relate to manufacture, sale, possession etc of metal knuckles.
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There is no such Penal Code 21819. Maybe you are looking at a city ordinance or municipal code. For all California Penal Code, you can look them up online at : http://www.leginfo.ca.gov/cgi-bin/calawquery?codesection=pen