S.D.M.G.

The S.D.M.G (Or Space Dolphin Machine Gun) is a straight upgrade to the Megashark, with a slightly faster firing rate and same ammo usage bonus, but with a noticeably higher damage output. It also gives +5% critical hit chance. Its abilities are similar to those of the Chain Gun, but it is more precise, deals slightly more damage, and has a slightly lower rate of fire.

The best modifier for the S.D.M.G is Unreal.

Trivia

 * This item is a reference to the game Edge of Space (hence the subtext 'It came from the edge of space'), in which Terraria is also referenced.
 * Space Dolphins are a race of creatures in the DC Comics universe, favored by the character Lobo.