3rd Party Controller

 is a gun. Upon hitting an enemy, they will move in the same direction the player moves, and shoot towards the crosshair if the player shoots. Their bullets will damage other enemies as well as the player. The player keeps controlling the enemy even when they switch to another gun.

It is possible to control multiple enemies at once. On each enemy controlled, a black line will connect to them and a P1 icon will appear over their head.

Bugs

 * If 3rd Party Controller is used on an enemy that replicates itself (e.g. Misfire Beast, Killithid), the enemy will duplicate a lot more than intended causing huge lag and a high chance of death due to the projectile spam.
 * If the weapon is controlling a Det, its laser attacks will print red traces of its attack that remain forever. This effect is, however, only cosmetic.
 * Ashen Bullet Kin cannot shoot when controlled.

Trivia

 * The synergy is a reference to MadCatz Interactive, formerly one of the leading producers of third-party gaming controllers.
 * "Assuming Direct Control" is a reference to Harbinger from "Mass Effect 2" who, before gaining control over any regular enemy, would announce it by saying this phrase.
 * During the reloading animation of this gun, the Gungeoneer destroys the controller and takes out a new one.
 * The description implies that the 3rd Party Controller belonged to The Cultist.