Flanked by family members of the Parkland shooting victims during the signing ceremony Friday, Scott affirmed that the "historic legislation" would help insure that "every student in Florida has the right to learn in a safe environment". According to the lawsuit filed by the gun association, the new legislation goes against the Second and Fourteenth Amendments of the United States Constitution.
"We filed a lawsuit against the state for violating the constitutional rights of 18 to 21 year olds", said Marion Hammer, lobbyist for the NRA in Florida.
Still, other states appeared ready to follow Florida's lead on at least some new gun-safety measures.
The bill fell short of achieving the ban on assault-style weapons sought by survivors.
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A controversial part of the new law is known as the Coach Aaron Feis Guardian Programme, which arms some teachers if both the local school district and local sheriff's department agree. The governor publicly supported the bill but was mainly concerned with the act of arming teachers.
And Manhattan-based parent activist and documentary filmmaker Pamela French, whose kids attend LaGuardia High School and Eleanor Roosevelt High School, is offering to collect voter registration forms completed by city students.More news: 11 people on board plane that crashed in Iran
Where: Students, teachers and administrators from across the country and in European countries have said they will participate.
President Donald Trump has voiced support for the idea, also espoused by the NRA.
But the families of some of the 17 students and staffers who died signed a letter urging Scott to "quickly sign this historic legislation into law". "I'm going to be an NRA member when I'm not governor", Scott said.
Florida lawmakers passed a bill this week that raises the minimum age for purchasing firearms from 18 to 21, and implements a three-day waiting period for purchase of most long guns.
It said the bill "strips law-abiding adults aged 18-20 of their Second Amendment right to self-protection" and called the expansion of waiting periods for gun purchases "unnecessary".
On Wednesday, a grand jury in Fort Lauderdale formally charged 19-year-old Nikolas Cruz, the suspect in the deadly school shooting in Parkland, with 17 counts of first-degree murder.
Given Florida's sorry history and Republican control of the legislature, it is not surprising - albeit still disappointing - that lawmakers were unwilling to meet some of the bolder demands of the Parkland students, including a ban on assault weapons and high-capacity magazines.
Cruz, now 19, had a history of mental issues, numerous encounters with police and was expelled from Stoneman Douglas past year for disciplinary problems, according to authorities.