Piranha Gun

The Piranha Gun is the first known weapon Vector reveals, which is only seen in Despicable Me.

Appearance
The Piranha Gun is a large pistol-like machine with a glass tank magazine somehow containing dozens of piranhas. It is white with a bright orange grip guard. It is a break-action weapon with no other reload mechanisms, and does not accept adaptable standalone magazines. When fired, the piranhas will slide out and arc with gravity, similar to a grenade, and they will attack all targets on sight. The weapon's range is significantly worse than a conventional pistol as a result, although the projectiles are able to pursue enemies on their own with great effectiveness.

Despicable Me
At the Bank of Evil, after Vector introduced himself to Gru, he introduces him to the Piranha Gun, a weapon he developed. He gives Gru a demonstration, but it goes wrong as he tries to reload it but gets bitten by the fired piranha. Gru does not take interest in the weapon and ignores Vector entirely. He later attempts to use it on Gru when he jumps onto his rocket, but gets electrocuted and loses it. He was shown holding it again when he had prevented Margo from Jumping but lost it again when the Moon struck him. The weapon is never seen for the rest of the film.

Trivia

 * The fact that Vector was able to retrieve it after it had fallen from the sky the first time speaks volumes to its durability and Vector's ingenuity.
 * Like all of Vector's products, the Piranha Gun seems to defy natural laws. It is not only able to reserve space inside for more than one piranha, but it keeps them all alive and healthy for unspecified periods of time.
 * Its ability is very similar to Terraria's Piranha Gun, a pistol that fires a mechanical homing piranha which pursues enemies automatically and likely took inspiration from Vector's creation.