Cold gun

The Cold Gun is a weapon that was designed by Cisco Ramon at S.T.A.R. Labs, to stop Barry Allen in case he used his powers for negative purposes.

History
The gun was designed by Cisco, unknown to both Harrison Wells and Caitlin Snow as a failsafe in case Barry ever turned out be a psychopath or was unable to control his powers after he woke up from his coma.

A S.T.A.R. Labs "janitor" stole the gun and brought it to Leonard Snart as a means to defeat the Flash, the gun was later used against the janitor and killed him. Snart continued to use the weapon as his weapon of choice, deciding to attack the Central City museum and he managed to not only shoot Barry in the stomach but also kill a security guard. Later, the gun was used to derail a train as Snart was about to make his get away from the robbery of a diamond, only to be stopped from killing the Flash by Cisco, Caitlin and Felicity Smoak who claimed to have a cold gun that was more powerful then Snarts, he later departed and kept the gun with him, turning off the GPS system that was built into it.

Snart used it in his partnership with Rory, first firing it at the Central City Police who had anti-cold shielding in the form of compressed heating ribbons in their ballistic shields, then against the Flash himself. Ultimately, it was disabled by "crossing streams" with the Heat Gun, with their respective "absolute cold" and "absolute hot" canceling each other out and disabling both weapons, with them both being taken into the custody of Cisco Ramon at S.T.A.R. Labs.

After Cisco was captured by the Rogues, they force him to make a new Cold Gun for Leonard, to replace the one that was taken from him, otherwise they were going to kill Cisco's brother Dante.

When Lisa Snart came to Team Flash for help, thinking that Leonard Snart was kidnapped, Cisco demonstrated that the Cold Gun could be traced through military technology and be located from where it was last used. When Leonard Snart was forced to work with his father, Lewis, he used the gun to freeze the beams of the laser gird, effectively dispatching it.

Snart later upgrades the Cold Gun following his breakout from Iron Heights; he makes it so that if he lets go of the handle of the gun at any stage, the core of the gun goes critical and it will explode.

Weapon specifications

 * Absolute Zero Blast: The gun, as explained by the thieving S.T.A.R. Labs janitor who stole it, shoots a blueish "white flame" that lowers temperature. Actually, the gun contains a micro-engine that generates a blast or beam of absolute zero or subzero cold. The engine projects the cold as a blast that can freeze anything on impact. It's so powerful, it incapacitated The Flash and slowed his speed. The goggles that came along with it are a way to protect the user from the glare of said blast
 * GPS System: The gun has a GPS system built into it, it can be tracked by S.T.A.R. Labs, however, the GPS can also be deactivated by the user. The second version of the gun, lacking this system, relies upon the tracker to search for ultraviolet "cold" signatures through military tracking technologies.

Known users

 * Leonard Snart/Captain Cold
 * S.T.A.R. Labs (formerly)

Trivia

 * Snart has memorized the entire design of the Cold Gun, this way he can repair it, if it is damaged. He had Rory do the same with his flamethrower.