This was previously glitched but has now been patched.
The DRAKON I is a sniper rifle that can be equipped to the LIGHT CLASS.
Normally you have to unlock it by buying it in the custom class purchase menu for $75000 in-game money (which would be a lot of matches to grind out) but you can also find it for free in one of the default classes called "LIGHT LOADOUT 2" when you first spawn in to a game r via changing your class mid-game.
If you pre-ordered the game you should also have it on the "EAGLE EYES" class.
When this is patched just kill 100 human or bot players over any amount of matches with the gun. Kills on zombies don't count.