Nation Gun advocacy groups sue California over new law that bans firearms sales to ‘law-abiding adults’ under 21 July 3, 2019 Vandana Ravikumar, USA TODAY Comments Off on Gun advocacy groups sue California over new law that bans firearms sales to ‘law-abiding adults’ under 21 Several gun advocacy groups filed a lawsuit to challenge a new California law banning the sale of firearms to people under 21 years of age.