Connecticut’s most wide-ranging gun control measure since the 2013 law enacted after the Sandy Hook Elementary School shooting takes effect Sunday, with proponents vowing to pursue more gun legislation despite legal challenges happening across the country.

The new law, signed by Democratic Gov. Ned Lamont in June, bans the open carrying of firearms and prohibits the sale of more than three handguns within 30 days to any one person, with some exceptions for instructors and others.

“We will not take a break and we cannot stop now, and we will continue to pass life-saving laws until we end gun violence in Connecticut. Our lives depend on it,” said Jeremy Stein, executive director of Connecticut Against Gun Violence.