"Limiting magazine capacity for law-abiding citizens to 10 rounds decreases public safety by giving violent criminals an advantage and thus decreasing the likelihood that a victim will survive a criminal attack," the suit read, as quoted by the Chronicle.
City Attorney Dennis Herrera told the newspaper that San Francisco was prepared to "litigate aggressively" to defend the measure, calling the city a "top target" for the NRA.
The NRA also plans to sue Sunnyvale, Calif., where voters approved a similar measure on Nov. 5, according to the Chronicle. The organization had threatened to sue the state of California if Gov. Jerry Brown (D) signed a bill banning the sale of semi-automatic weapons with detachable magazines, but Brown vetoed that legislation last month.
[h/t Huffington Post]