The maker of the rifle used in the Sandy Hook Elementary School shooting asked the U.S. Supreme Court to hear its appeal Thursday of a state ruling against the company.

Remington Arms, based in Madison, North Carolina, cited a much-debated 2005 federal law that shields firearms manufacturers from liability in most cases when their products are used in crimes.

Gunman Adam Lanza opened fire at the Newtown, Connecticut, school with a Bushmaster AR-15-style rifle on Dec. 14, 2012, killing 20 first graders and six educators. The 20-year-old gunman earlier shot his mother to death at their Newtown home, and killed himself as police arrived at the school. The rifle was legally owned by his mother.

A survivor and relatives of nine victims filed a wrongful death lawsuit against Remington in 2015, saying the company should have never sold such a dangerous weapon to the public and alleging it targeted younger, at-risk males in marketing and product placement in violent video games.

Citing one of the few exemptions in the federal law, the Connecticut Supreme Court ruled 4-3 in March that Remington could be sued under state law over how it marketed the rifle to the public. The decision overturned a ruling by a trial court judge who dismissed the lawsuit based on the 2005 federal law, named the Protection of Lawful Commerce in Arms Act.

The federal law has been criticized by gun control advocates as being too favorable to gun makers, and it has been used to bar lawsuits over other mass killings.

The case is being watched by gun control advocates, gun rights supporters and gun manufacturers across the country, as it has the potential to provide a roadmap for victims of other mass shootings to circumvent the federal law and sue firearm makers.