This build is fairly cheap and acts as a street-[Sweeper] against large hordes of enemies. Gas procs create AoE damage clouds that deal enormous amounts of damage to biological enemies. It isn't accurate and doesn't have great range, but anything within 30-40m gets melted. Vicious Spread and Blaze create amazing synergy because blaze double-buffs the weapon damage and VS not only buffs damage, but also increases spread, which creates walls of damage due to your 100% change of firing a second projectile and 60% chance of firing a third.