|Weapon Type||Stun Grenade|
|Internal name|| |
- "We got a brand new grenade for you! A Concussion Grenade that'll stun all enemies within the blast radius. It won't damage an enemy, but instead you'll get a bunch of sitting ducks - making those headshots easier. They come in packs of 6, have a 4 second stun, and are perfect for crowd control."
- —Announcement site description.
Comcussion grenades are a type of non-lethal throwable, dealing a flat zero damage to any enemy caught in the blast, but creates a blinding flash that stuns them for 4 seconds instead, making it a valuable weapon to have for crowd control.
Upon throwing a concussion grenade, a flash will be produced and most nearby units will be fazed by it, incapable of moving nor attacking. In addition, all units caught within the blast radius is given a 50% accuracy debuff for 5 seconds after being stunned. Bulldozers will not be affected by it and are still capable of attacking and/or moving.
If human players are in the range of a detonated concussion grenade, they will be affected by it as well, both hearing and vision will be temporarily impaired until the effect wears out, though no damage is inflicted.
Even dominated enemies are not immune, and they will also be fazed by it. They cannot be"dominated" again for converting nor will attack.
Concussion grenades are best used against groups of enemies, especially on the One Down difficulty, due to them having much higher health and tendency to bunch up together. It is often thrown as a last resort measure when ammunition becomes scarce. A concussion grenade can be used when running near or through said groups is a prioritized risk, especially when there is an incapacitated player that needs rescue and enemies nearby cannot be quickly dispatched. These grenades can even be thrown to allow a window to escape.
While not damaged, human players will also have their hearing and vision will be impaired. Throwing one at them can be a costly mistake, as they will not be able to judge a threat as easily until their senses return to normal.
Bulldozers are immune to the stun effects, thus it is not recommended to use said grenades against them.
The major drawback is the duration of the concussion grenade; law enforcement will only be vulnerable for four seconds. However, players can carry up to 6 and can "spam" them. The Grenade Case asset should be bought if these grenades will be used often and an Enforcer with Fully Loaded Aced can benefit the most.
| Fire in the Hole!|
Throw 100 grenades.
- Dominated enemies affected by Concussion Grenades will permanently be locked in the "scared" position.
- The Concussion Grenade is based on the M84 stun grenade, more commonly referred to as a "flashbang".
- The terms "concussion grenade" and "stun grenade" are not interchangeable; Concussion grenades are designed to kill enemies in close combat without creating shrapnel that could harm friendly personnel, while stun grenades are designed to disorient persons non-lethally. Strangely, the Concussion Grenade's model is correctly labeled as a stun grenade.
- Concussion Grenades will leave behind small plumes of fire after detonation, which is reflective of their real-world counterparts' use of chemical pyrotechnics to produce flashes.
- Real flashbangs, while designed to be relatively inert when detonated, do produce small flames in the form of the pyrotechnics that consumes its inner aluminium case to create the flash. As such, activating one can cause explosions and fire under the presence of certain gasses like propane or other flammable vapors such as ether.
- Close proximity to lighly-protected or bare flesh may also cause burns ranging from mere minor swelling to life-threatening third-degree mutilations. Some cases of flashbangs going off too close to pedestrians have reportedly resulted in permanent scars, dismemberment, and even death.
- The Concussion Grenade is the third throwable weapon to have a carry capacity higher than 3, and the first grenade-type weapon to do so. Additionally, it is the first throwable weapon to not deal damage whatsoever.
- The Concussion Grenade is the third non-DLC throwable in the game, but unlike the Ace of Spades and HEF Grenade, the Concussion Grenade does not require being a member of the PAYDAY 2 Steam Group, making it first fully free throwable.
- The Concussion Grenade, despite very obviously being manufactured, was apparently made by Wolf, as stated by himself in the Housewarming Party site's day 4 header. It is possible that the heister may have modified them somehow, however.
- From a realistic standpoint, these grenades should be most effective against Cloakers due to said units' nightvision goggles. The bright flashes coming from the grenades, while not blindingly bright due to the goggles' light filter, would still be amplified to a degree enough to cause slight vision impairment and throw off their aim. The concussive disorientation effect is played straight, however, and can interrupt a Cloaker mid-charge.
- Bulldozers are not affected by concussion grenades even without their visors.