@Humpleupagus @LudditeMan California's Penal Code Section 12550 is legal to own a slingshot as long as certain guidelines are followed. These guidelines include:

The slingshot must not be capable of shooting metallic projectiles.
The slingshot must not be used to shoot at people, animals, or property.

No officer troglodyte, that buckshot is for my reloading bench. Works great in my sling shot too!