The uzi is a player weapon in Hacx. It has an extremely high rate of fire and can be fired very quickly. However it has to be reloaded after every burst of fire, leaving the player briefly defenseless. It is also highly inaccurate making it ineffective against single targets at a distance. It does the same damage and has the same accuracy as Doom's chaingun.
It uses the same type of ammo of the pistol, the rounds.