Uncraftable Big Kill
Normally usable in crafting, this item is uncraftable, also known as 'dirty'. For a short amount of time you could receive this item from the Mann Co. Package as uncraftable. This was a glitch because the weapon was never available in the Mann Co Store.
There are 7 known instances of tradable 'dirty' Big Kill.
The Big Kill
Team Fortress 2 Limited Level 5 Revolver
Combines style with stopping power. Long exclusive to Freelance Police, now available for other blood-thirsty mercenaries.
( Not Usable in Crafting )