SACRAMENTO, Calif. -- Weeks after New York enacted the nation's toughest gun laws, California lawmakers said Thursday they want their state to do even more in response to recent mass shootings, particularly the Connecticut school massacre.

Democrats who control the state Legislature revealed 10 proposals that they said would make California the most restrictive state for possessing firearms.

They were joined at a Capitol news conference by San Francisco Mayor Ed Lee and Los Angeles Mayor Antonio Villaraigosa, along with several police chiefs.

"California has always been a leader on the issue of gun safety," Villaraigosa said. "New York has stepped up and stepped forward. California needs to answer the call."

Among the measures is one that would outlaw the future sale of semi-automatic rifles with detachable magazines. The restriction would prevent quick reloading by requiring bullets to be loaded one at a time.

Lawmakers also want to make some prohibitions apply to current gun owners, not just to people who buy weapons in the future.

Like New York, California also would require background checks for buying ammunition and would add to the list of prohibited weapons.

Those buying ammunition would have to pay a fee and undergo an initial background check by the state Department of Justice, similar to what is required now before buyers can purchase a weapon. Subsequent background checks would be done instantly by an ammunition seller checking the Justice Department's records.

The legislation also would ban possession of magazines holding more than 10 bullets, even by those who now own them legally. All weapons would have to be registered.

Sam Paredes, executive director of Gun Owners of California, promised that gun proponents will fight the measures in court if they become law.

"It strikes me as if these folks are playing some sort of game of one-upsmanship with New York at the expense of law-abiding citizens, and that's just unconscionable," he said about lawmakers.

Three bills have been introduced, with others to come before this month's deadline for submitting legislation.

The measures are the most stringent to date among numerous proposals introduced this year to strengthen California's firearm regulations.

Senate President Pro Tem Darrell Steinberg said he is confident Democrats can use their majorities in the Assembly and Senate to send the measures to Democratic Gov. Jerry Brown this year.

Brown has declined to comment on weapons legislation before it reaches him.

Steinberg said the measures are designed to close numerous loopholes that gun manufacturers have exploited to get around California's existing restrictions.

Those measures had been the strongest in the nation until Gov. Andrew Cuomo signed New York's new law last month.

Other proposed measures in California would ban so-called "bullet buttons" that can be used to quickly detach and reload magazines in semi-automatic rifles, and update the legal definition of shotguns to prohibit a new version that can rapidly fire shotgun shells and .45-caliber ammunition.

The state also would restrict the lending of guns to keep weapons from felons, mentally ill people and others who are prohibited from ownership.

Loading Slideshow...
  • 1981: The Attempted Assassination Of President Ronald Reagan

    on March 30, 1981, President Reagan and three others were shot and wounded in an assassination attempt by John Hinckley, Jr. outside the Washington Hilton Hotel in Washington, D.C. Reagan's press secretary, Jim Brady, was shot in the head.

  • 1993: The Brady Handgun Violence Act

    The Brady Handgun Violence Act of 1993, signed into law by President Bill Clinton, mandated that federally licensed dealers complete comprehensive background checks on individuals before selling them a gun. The legislation was named for James Brady, who was shot during an attempted assassination of President Ronald Reagan in 1981.

  • 1994: The Violent Crime Control and Law Enforcement Act

    The Violent Crime Control and Law Enforcement Act, signed into law by President Bill Clinton in 1994, instituted a ban on 19 kinds of assault weapons, including Uzis and AK-47s. The crime bill also banned the possession of magazines holding more than ten rounds of ammunition. (An exemption was made for weapons and magazines manufactured prior to the ban.)

  • 2004: Law Banning Magazines Holding More Than Ten Rounds Of Ammunition Expires

    In 2004, ten years after it first became law, Congress allowed a provision banning possession of magazines holding more than ten rounds of ammunition to expire through a sunset provision. Brady Campaign President Paul Helmke told HuffPost that the expiration of this provision meant that Rep. Gabby Giffords's alleged shooter was able to fire off 20-plus shots without reloading (under the former law he would have had only ten).

  • 2007: The U.S. Court of Appeals For The District Of Columbia Rules In Favor Of Dick Heller

    In 2007 The U.S. Court of Appeals for the District of Columbia ruled to allow Dick Heller, a licensed District police officer, to keep a handgun in his home in Washington, D.C. Following that ruling, the defendants petitioned the U.S. Supreme Court to hear the case.

  • 2008: The NICS Improvement Amendments Act

    Following the deadly shooting at Virginia Tech University, Congress passed legislation to require states provide data on mentally unsound individuals to the National Instant Criminal Background Check System, with the aim of halting gun purchases by the mentally ill, and others prohibited from possessing firearms. The bill was signed into law by President George W. Bush in January of 2008.

  • 2008: Supreme Court Strikes Down D.C. Handgun Ban As Unconstitutional

    In June of 2008, the United States Supreme Court upheld the verdict of a lower court ruling the D.C. handgun ban unconstitutional in the landmark case <em>District of Columbia v. Heller</em>.

  • Gabrielle Giffords And Trayvon Martin Shootings

    Gun control advocates had high hopes that reform efforts would have increased momentum in the wake of two tragic events that rocked the nation. In January of 2011, Jared Loughner opened fire at an event held by Rep. Gabrielle Giffords (D-Ariz.), killing six and injuring 13, including the congresswoman. Resulting attempts to push gun control legislation <a href="http://www.huffingtonpost.com/2012/04/09/trayvon-martin-shooting-gun-debate_n_1413115.html" target="_hplink">proved fruitless</a>, with neither proposal even succeeding in gaining a single GOP co-sponsor. More than a year after that shooting, Florida teenager Trayvon Martin was <a href="http://www.huffingtonpost.com/news/trayvon-martin" target="_hplink">gunned down</a> by George Zimmerman in an event that some believed would bring increased scrutiny on the nation's Stand Your Ground laws. While there has been increasing discussion over the nature of those statutes, lawmakers were <a href="http://www.huffingtonpost.com/2012/04/09/trayvon-martin-shooting-gun-debate_n_1413115.html" target="_hplink">quick to concede</a> that they had little faith the event would effectively spur gun control legislation, thanks largely to the National Rifle Association's vast lobbying power. Read more <a href="http://www.huffingtonpost.com/2012/04/09/trayvon-martin-shooting-gun-debate_n_1413115.html" target="_hplink">here</a>:

  • Colorado Movie Theater Shooting

    In July of 2012, a heavily armed gunman <a href="http://www.huffingtonpost.com/2012/07/20/aurora-shooting-movie-theater-batman_n_1688547.html" target="_hplink">opened fire on theatergoers</a> attending a midnight premiere of the final film of the latest Batman trilogy, killing 12 and wounding scores more. The suspect, James Eagan Holmes, allegedly carried out the act with a number of handguns, as well as an AR-15 assault rifle with a 100-round drum magazine. Some lawmakers used the incident, which took place in a state with some of the laxest gun control laws, to bring forth legislation designed to place increased regulations on access to such weapons, but many observers, citing previous experience, were <a href="http://www.huffingtonpost.com/2012/07/20/batman-shooting_n_1690547.html" target="_hplink">hesitant to say</a> that they would be able to overcome the power of the National Rifle Association and Washington gun lobby.

  • Sikh Temple Shooting

    On August 5, 2012, white supremacist Wade Michael Page opened fire on a Sikhs gathered at a temple in Oak Creek, Wis., killing six and wounding four more before turning the gun on himself.