VertebraeK-47

 is a gun that fires homing, piercing bullets. Bullets close to each other will link together, hurting enemies that touch the link.

Trivia

 * The weapon's name is a portmanteau of 'vertebrae' and 'AK-47'. Vertebrae are bones which a spine consists of, and the AK-47 is an assault rifle.
 * Possibly a reference to the film Existenz, where a character forms a weapon out of several bones.
 * The description of the gun is a reference to the Jake Clover game, Nuign Spectre.