"Weapon" means an object, device, or instrument which when used against a person is likely to or actually does result in serious bodily injury or death or any replica, article, or device having the appearance of such a weapon including, but not limited to, [...]

"Weapon" means and includes any pistol, revolver, or any weapon designed or intended to propel a missile of any kind, or any dirk, bowie knife, switchblade knife, ballistic knife, any other knife having a blade of two or more inches, straight-edge razor, [...]

(4) "Weapon" means a firearm as such term is defined in Section 921 of Title 18 of the United States Code.