M2 Flamethrower
The M2 Flamethrower was used by Americans in WWII. It was so good that it made its way into Call of Duty: World at War and turned Nazi Zombies into a living hell.
The M2 is the only weapon that can make zombies cry.
I used the M2 in campaign and roasted Nazis like they were marshmallows.
My friend got the M2 in multiplayer and I got roasted for it.