Completely Awesome

The Arms Dealer sells the Minishark for 35 gold - he moves in once anyone in the world holds a bullet-firing gun (a Musket from Shadow Orbs or The Undertaker from Crimson Hearts does it, Smashing, Poppet!). Save up, buy, brrrt. It remains a solid sidearm all the way to its Mecha Mayhem-era upgrade, the Megashark.