The N.R.A. asserted that the law was a particularly egregious violation of the rights of young women, who they contended “pose a relatively slight risk of perpetrating a school shooting such as the one that occurred at Marjory Stoneman Douglas High School, or, for that matter, a violent crime of any kind.”

Standing with a group of families who had traveled to the State Capitol from Parkland, an emotional Mr. Scott called the classmates of the slain students and their parents his inspiration, and praised them for helping persuade lawmakers to pass legislation, even if neither they nor he agreed with all of its provisions.

“You made your voices heard,” he told the Stoneman Douglas High students. “You helped change your state. You made a difference. You should be proud.”

Outside of Tallahassee, the law might not look that groundbreaking: It does not go as far as laws enacted by other more Democratic-leaning states after deadly shootings. Connecticut expanded a ban on assault weapons, prohibited the sale of high-capacity ammunition magazines and imposed stricter background checks on gun purchases after 20 children and six educators were killed at Sandy Hook Elementary School in Newtown in 2012. Colorado required background checks for private gun sales and limited magazines after 12 people were killed at a movie theater in 2012.

But this is Florida, a laboratory for the N.R.A.[1] and a state that has become recognized for its consistent efforts under legislative Republican control since 1996 to expand gun rights. For example, residents only have to comply with a simple protocol to obtain permits to carry concealed weapons. And Florida has embraced “Stand Your Ground” laws that protect the use of deadly force in public.

That such a gun-friendly state adopted any firearm restrictions represents a sea change, even more so that the restrictions were drafted and approved in a matter of three weeks, after a bipartisan vote and the signature of a Republican governor who will likely be on the ballot later this year as a Senate candidate.

“If you would have had this conversation with me before session, I would’ve said it’s just not going to happen,” said Senator René García, a moderate Republican from the Miami area who has served 16 years in the Legislature. “Not only did we get this bill passed, but the fact that we had debate on these amendments on the floor was huge. I don’t remember having these debates on the floor ever before.”

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The N.R.A. has had to contend with other states also considering action since the Parkland shooting. In Illinois, lawmakers passed a bill[3] last week that would require gun dealers to be licensed by the state, but it was not clear whether the Republican governor would sign it into law. In Vermont, lawmakers advanced legislation that would raise the minimum age[4] to buy a gun to 21 and allow for

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