M84 Stun Grenade

The M84 Stun Grenade, also commonly known as the Flashbang or simply Stun Grenade, is a grenade/equipment that stuns it's enemies by slowing them down or blinding them with a flash.

Underground Railroad
The M84 Stun Grenade appears in RisingSun2013's map Underground Railroad. When hitting an enemy with it, they will be stunned, and will stand in place holding their head as if they were hit by a bolt of lightning from the Wunderwaffe DG-2, for a couple of seconds (it varies between 4 and 10).