Sentence Enhancements — California Penal Code — "Firearm" defined Date: 15 Sep 2016 TEXT PDF Current through the 2016 Legislative Session As used in this title, "firearm" has the meaning provided in subdivision (a) of Section 16520. Ca. Pen. Code § 12001 Added by Stats 2010 ch 711 (SB 1080),s 5, eff. 1/1/2011, op. 1/1/2012.