The Supreme Court ruling expanding gun rights threatens to upend firearms restrictions across the country as activists wage court battles over everything from bans on AR-15-style guns to age limits.

The decision handed down in June already has led one judge to temporarily block a Colorado town from enforcing a ban on the sale and possession of certain semi-automatic weapons.

The first major gun decision in more than a decade, the ruling could dramatically reshape gun laws in the U.S. even as a series of horrific mass shootings pushes the issue back into the headlines.

“The gun rights movement has been given a weapon of mass destruction, and it will annihilate approximately 75% of the gun laws eventually,” said Evan Nappen, a New Jersey gun rights attorney.

The court battles come as the Biden administration and police departments across the U.S. struggle to combat a surge in violent crime and mass shootings, including several high-profile killings carried out by suspects who purchased their guns legally.

And given the sheer number of cases now working through the courts, a lot more time will be spent in courtrooms no matter who wins.

“We will see a lot of tax dollars and government resources that should be used to stop gun crime being used to defend gun laws that are lifesaving and wildly popular,” said Jonathan Lowry, chief counsel and vice president at Brady, the gun control group.