Firebug (Killing Floor)

Rank	Fire damage required	Flamethrower			Flamethrower/MAC-10		MAC-10		Resistance to fire ↑	Spawn
		Reload speed ↑	Fuel capacity ↑	Range ↑	Damage ↑	Discount	Reload speed ↑	Mag size ↑
					5%	10%			50%
★	25,000	10%	10%		10%	20%	5%	12%	60%
★★	100,000	20%	20%		20%	30%	10%	24%	70%
★★★	500,000	30%	30%	50%	30%	40%	15%	36%	80%	Incendiary grenades †
★★★★	1,500,000	40%	40%		40%	50%	20%	48%	90%
★★★★★	3,500,000	50%	50%	100%	50%	60%	25%	60%	100%	Flamethrower †
☆	5,500,000	60%	60%		60%	70%	30%			Combat armour
† Denotes an item also available to all additional levels of the perk.