Arc Cannon

You evoke a gun that shoots lightning bolts in your free hand. The gun is in size, shape and function to a flintlock pistol or a pistol, if appropriate for the setting, and lasts for the duration. If you let go of the cannon, it disappears, but you can evoke the gun again as a bonus action. You can use your action to make a ranged spell attack with the sparking gun, with a range equal to the long range of the gun. On a hit the target takes 3d6 lightning damage. You have advantage on attack roles against targets made entirely out of metal.