Scar

How To Obtain
Get to Level 10, then you can equip it in your Primary Slot.

Trivia

 * 1) The Scar actually used to have a scope, this was only used for testing purposes and was quickly removed after a few days. Though players took advantage of the fact that you can get easy headshots with the Scar and at the time it did 15 critical damage, making it temporarily one of the most powerful weapons in the game as it could easily shred bosses.
 * 2) The Scar was heavily nerfed from it's 7.5 damage and 15 critical damage down to it's present day stats when it was rebalanced after the removal of it's scope.