The governor of Connecticut, the state where 20 children were shot dead at school in December has signed some of the strictest gun control laws in the United States.
The BBC reports the state assembly passed the legislation on THursday morning by 105 to 44 after more than a dozen hours of debate.
Governor Dannel Malloy signed the bill soon after midday. Some of the measures take effect immediately.
As well as a registry of gun offenders, the restrictions introduce background checks on all firearms buyers and a ban on new magazines holding more than 10 rounds.
The law also expands the state's assault weapons ban by 100 firearms, including the Bushmaster AR-15, which was used by Adam Lanza, 20, in the shooting in Newtown.
Colorado, New York and California are among five states that have tightened their gun laws since the massacre in which 26 children and adults were killed. Ten others have passed laws loosening gun controls.