Out here we've always called Grenade whether its a grenade that goes bang or a dummy grenade with set rules for radius for kill zones.
Either way everyone playing knows a grenade is inbound and watches or moves accordingly.
Better to be safe then sorry.
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http://airsoftcanada.com/showthread.php?t=174161 - Honour & Respect your fellow players! #Airsofthonourandrespect