The Chainsaw is a cut weapon from Zombie Master, it was only available in very early Alpha tests, it is extremely powerful, but were to count ammunition unlike most other Melee weapons
The Chainsaw is available in some custom servers and via-mods.
The Chainsaw was known as 'The Banshee´s worst nightmare''.
It exists a unusual reskin for the Sledgehammer to become a Chainsaw.
The Chainsaw´s model has a bit of blood, possibly indicating that it was used by other survivors to fight zombies.
As seen in the SDK test, the Chainsaw seems to not have smoke coming out of it, instead of in real life.
In an early Zombie Master picture,rotinaj is seen fighting Drifters with a Chainsaw.