A Missouri state law that declared several federal gun laws "invalid" is unconstitutional, a U.S. federal judge ruled on Tuesday, handing the U.S. Justice Department a victory in its bid to get the law tossed out. At issue was a measure Republican Governor Mike Parson signed into law in 2021 that declared that certain federal gun laws infringed on the rights of individuals to keep and bear arms under the U.S. Constitution’s Second Amendment.