Shok-Tac Version V Concussion Grenade Use: Stun enemies for a few seconds. Warning!: The flash suppressant augmentation upgrade may be used to negate the effects of concussion grenades. Description: The Shok-Tac Concussion Grenade is a non-fragmenting, hand-thrown munition that uses explosive overpressure to damage and disorient targets at close range. The Version V combines the common function of a concussion grenade with the noise/flash capability of a diversionary device (or 'flashbang') for a 'one-two-three punch'. It is most effective against organic targets at close quarters in a confined environment, but has zero effect on robots.