Restrictions on semiautomatic handguns
California also classifies semiautomatic handguns with certain features as "assault weapons"
12276.1. (a) Notwithstanding Section 12276, "assault weapon" shall also mean any of the following:
(4) A semiautomatic pistol that has the capacity to accept adetachable magazine and any one of the following: (A) A threaded barrel, capable of accepting a flash suppressor,forward handgrip, or silencer. (B) A second handgrip. (C) A shroud that is attached to, or partially or completelyencircles, the barrel that allows the bearer to fire the weaponwithout burning his or her hand, except a slide that encloses the barrel. (D) The capacity to accept a detachable magazine at some locationoutside of the pistol grip. (5) A semiautomatic pistol with a fixed magazine that has thecapacity to accept more than 10 rounds.
Unlike rifles, there is no requirement for pistols to be centerfire, only semiautomatic.