Minishark

The Minishark is a machine gun that can be bought from the Arms Dealer and uses musket balls or Meteor Shot. It has a speed of 'Insanely Fast' and deals 5 damage per shot not including ammunition used.

It can be crafted into a Star Cannon.

When talking to the Arms Dealer, he reacts when you are staring at his Minishark, and tells you "You don't want to know how it was made".