The legislation includes enhanced background checks for younger buyers and US federal cash for states introducing 'red flag' laws that allow courts to temporarily remove weapons from those considered a threat.
US President Joe Biden has signed a bipartisan gun safety bill into law, the first major federal gun reform in three decades, days after the Supreme Court expanded gun rights.
"This is monumental day," Biden said at the White House, with his wife Jill by his side on Saturday.
"God willing, it's going to save a lot of lives."
The Supreme Court on Thursday declared for the first time that the US Constitution protected an individual's right to carry a handgun in public for self-defence.
Gun control has long been a divisive issue in the nation with several attempts to put new controls on gun sales failing time after time.
Tune in as I sign into law S. 2938, the Bipartisan Safer Communities Act, and deliver remarks on reducing gun violence and saving lives. https://t.co/evfofKN84e— President Biden (@POTUS) June 25, 2022
The new legislation includes provisions to help states keep guns out of the hands of those deemed to be a danger to themselves or others and blocks gun sales to those convicted of abusing unmarried intimate partners.
It does not ban sales of assault-style rifles or high-capacity magazines.
The law does take some steps on background checks by allowing access, for the first time, to information on significant crimes committed by juveniles.
It also cracks down on gun sales to purchasers convicted of domestic violence.
It provides new federal funding to states that administer "red flag" laws intended to remove guns from people deemed dangerous to themselves and others.
Biden said he would host an event in July for victims of gun violence to mark the bill's signing.
"Their message to us was do something ... today we did," said Biden.
'Is the Supreme Court broken?
Biden also repeated his criticism of the Supreme Court's ruling on Friday, which eliminated the constitutional right to abortion nationwide, and said his administration was going to focus on how states implemented the decision and make sure they did not violate other laws.
"Is the Supreme Court broken? The Supreme Court has made some terrible decisions," Biden said.
"Jill and I know how painful and devastating the decision is for so many Americans and I mean so many Americans. We're going to take action to protect women’s rights and reproductive health."