Marty Airsoft reviews the TAG-19 pyro grenade for airsoft use made by TAG Innovations/Airsoft Pyrotechnics. If there is an uncanny resemblace to a real world grenade, it is because it is based on the RGD-5, the fragmentation grenade developed by the Soviet Union in 1950s and it is still in use by many countries who were in the Soviet Union's orbit during the Cold War.