Lamont, a Democrat, plans to sign the measure.
Among other things, the changes would ban openly carrying firearms and prohibit selling more than three handguns within 30 days to any one person.
Other provisions include expanding Connecticut’s current assault weapon ban to include some other similar weapons; stiffening penalties for possession of large-capacity magazines; expanding safe-storage rules; and adding some domestic violence crimes to the list of disqualifications for having a gun.
The measure passed the Senate 24-11, following a 96-51 House vote last week. Democrats control both chambers.
Nationwide, Democratic-led states have enacted new laws to restrict semiautomatic weapons and expand background checks and waiting periods to buy guns.
Republican-controlled states have backed the right to carry concealed guns without permits or for trained staffers to bring guns to school.
In Connecticut, Republican lawmakers have complained that majority Democrats are punishing law-abiding gun owners, not targeting criminals who commit gun violence.
Adapted from reporting by the Associated Press