M60 Machine Gun

The M60 is a special tier weapon that made it's debut in the Left 4 Dead 2 DLC, The Passing. It carries only 150 rounds and after that's depleted, the Survivor will revert back to a tier 1 primary weapon, much like with the Grenade Launcher.

Pros

 * Deals more damage, so killing Special Infected, mainly the Tank and Witch, is quicker.

Cons

 * You can't refill the ammunition, so when you are out of ammo for it, it will be dropped.