DA COLT
 So powerful it had to be written out of the show

 

Name: The Colt
Origin: Supernatural
Type: Revolver gun
Powers and Abilities: Enchanted to kill anything in creation with the exception of 5 things (Lucifer being one of those), the shot still needs to be a killshot regardless.
Destructive Capacity: Street level (it's conceptual hax)
Wielder(s): Samuel Colt, SamDean, BobbyCrowley and John (also some other guys throughout the ages)
Material or Element: Your standard 1863 Colt, but enchanted; how it was enchanted is unknown
Needed Prerequisite for Use: Fingers to pull the triger and bullets obviously
Notable Attacks/Techniques or Alternate Forms:

Other: The Colt was originally made with 13 unique bullets, in season 3 however Ruby assisted Bobby in remodeling it so it can be used with new ammunition (and still retain its 'kill everything' property of course)