Using only the 3 B.O.W Gas rounds and 3 Acid rounds in the grenade launcher. Although, after using the 3 B.O.W. Gas rounds, it's only necessary to use just 2 of the acid rounds. I just added that third acid shot in for good measure. This is just a quick demonstration as to "squashing the giant cockroach" in a matter of a few mere seconds. Originally recorded and highlighted from my justin.tv channel..