City lawyers said the ruling won't affect who might be eligible to register firearms.
There about 2 million privately owned firearms in the state.
The P320 is linked to multiple cases where users allege they were injured by an unintentional firing.
Businesses can use signage to indicate whether guns are allowed on premises.
Mass shootings have added momentum to efforts to hold companies liable.
The governor also signed a new law that will make it easier for prosecutors to bring felony charges.
Mayor Rick Blangiardi is expected to sign it.
With very few exceptions, research on the effectiveness of gun laws either doesn’t exist or is very weak. Does it matter?
Questions about how the law would be fully enacted have not yet been addressed.