The way the law is written, shooting some nerf guns is actually the same as shooting a 50cal.
I tried to explain to an old neighbor of mine - Korean war vet - that he couldn't just shoot a BB gun in his backyard legally, and he refused to believe me.
Gun or firearm: Any rifle, shotgun, revolver, pistol, air gun, air rifle or any similar mechanism by whatever name known which is designed to expel a projectile through a gun barrel by the action of any explosive, gas, compressed air, spring or elastic.
I tried to explain to an old neighbor of mine - Korean war vet - that he couldn't just shoot a BB gun in his backyard legally, and he refused to believe me.