"Holding produces more flashes to blind the enemy. Fully cooked 9-bangs create an EMP effect that stuns electronics."
— In-game description
The 9-Bang grenade appears in Call of Duty: Ghosts, this time available in multiplayer, whereas in campaign only the standard Flashbang is available. After every 0.75 second increment, one flashbang effect is added, and after 2.5 seconds, it is fully cooked and will finish off with an EMP effect after the flashbangs. If it is thrown without being cooked at all, only one flash occurs.
The EMP effect from fully cooking a 9-Bang temporarily disables enemy ground based equipment. Strong-Arm is a very useful perk due to it decreasing the time it takes to cook the 9-Bang to only 1.25 seconds. The flashbang effect has an 800 unit radius, or 20.32 meters, and a 512 unit range for the EMP (13.0048 meters).
"Tactical grenade that flashes and stuns. Can be cooked to detonate multiple times."
The 9-Bang returns in Call of Duty: Black Ops 4, appearing as a piece of Special Issue equipment exclusive to Kerk "Ajax" Rossouw. It could also be found in Blackout, but was removed for balancing purposes.