S.D.M.G.

The S.D.M.G (or Space Dolphin Machine Gun) is a straight upgrade from the Megashark, with a slightly faster firing rate and same ammo usage bonus, but with a noticeably higher damage output. 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 S.D.M.G. has a base 9% critical strike chance as opposed to the usual 4%.

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.
 * Prior to the Hotfix update of 1.2 on console, the S.D.M.G. was obtainable via the safe / piggy bank item ID glitch.

History
S.D.M.G.