Here's a quick overview of proposed gun control measures approved Thursday by the state Senate.Ammunition regulation: SB 1235 by Senate leader Kevin de Le&oacute;n (D-Los Angeles) requires background checks to buy ammunition. It also creates a license to sell ammunition, and creates a new system for collecting information about those sales.Ban on large ammunition magazines: SB 1446 by Sen. Loni Hancock (D-Berkeley) bans the ownership of any ammunition clip that holds more than 10 rounds.A plastic pistol made using a 3-D printer, described by some as a "ghost gun."Bullet buttons: SB 880 by Sen. Isadore Hall (D-Compton) expands the legal definition of an "assualt weapon" to include a group of rifles&nbsp;with ammunition clips that can be quickly swapped out by using a bullet to push a small release button.SB 894 by Sen. Hannah-Beth Jackson (D-Santa Barbara) requires&nbsp;reporting most lost or stolen guns within five days."Ghost guns": SB 1407 by De Le&oacute;n requires a person to get a serial number from state officials&nbsp;before making or assembling a gun.Gun violence research:&nbsp;SB 1006 by Sen. Lois Wolk (D-Davis) creates a new&nbsp;University of California center for researching gun-related violence.Two other bills, both of which originated in the Assembly,&nbsp;were amended by Senate Democrats.Gun theft: AB 1176 would make the theft of a gun a felony, a change in the 2014 law passed by voters as Proposition 47. As such, this proposal would have to be approved by voters on the Nov. 8 statewide ballot.Gun lending: AB 1511 places tighter&nbsp;rules on lending someone a gun -- limiting those loans&nbsp;to family members or&nbsp;a licensed hunter.