Recent mass shootings have spurred renewed calls from President Biden for a national assault weapons ban. Sensibly so. But for even the most ardent gun control advocates, it’s hard not to ask whether, in a nation with an estimated 400 million firearms, restrictions on new gun purchases accomplish too little without something more.

Amid the rising tide of firearms, reducing gun deaths and injuries requires new solutions. In San Jose, Calif., where I am mayor, we’ve embarked on two approaches untried in any other city or state: We’re imposing an annual fee on gun-owning residents and investing the revenues in violence prevention efforts. And on Jan. 1, the city will begin requiring gun owners to carry liability insurance to compensate victims harmed by the negligent or reckless use of a firearm.

These initiatives reflect the recognition that we can’t make 400 million guns go away, but we can make gun ownership safer. The recent surge in pandemic-era gun sales, the influx of […]