A federal appeals court on Tuesday upheld California’s ban on large-capacity ammunition magazines, reversing a San Diego federal judge’s rule that it was “unconstitutional” and handing a victory to Gov. Gavin Newsom and gun-control advocates. The California law, which was enacted in 2016, bans the possession of large-capacity magazines (LCMs) that hold more than 10 rounds of ammunition. The law also bans the manufacture and imports of LCMs. Under the law, owners of LCMs can modify them to accept ten rounds or fewer and sell their magazines to firearm dealers or remove them from the state. The law provides several exceptions to the ban on large-capacity magazines, including possession by active or retired law enforcement officers, security guards for armored vehicles, and holders of special weapons permits. U.S. District Judge Roger T. Benitez in San Diego previously blocked the ban, claiming that the law is illegal because it violates the Second Amendment right of gun …