Auto Shotgun

The Benelli M4 Super 90 semi-automatic shotgun (or colloquially, the "Result Gun") is a second-tier weapon and is a more powerful version of the pump shotgun that does not require a pump after each shot. It holds a maximum of 10 shells at a time with 128 in reserve and, like the pump shotgun, can be fired without loading all of the shells. It is the best short-range weapon in the game, capable of firing extremely fast and taking out massive amounts of Infected per shot.

The relatively small magazine and low accuracy compared to other second-tier weapons make it slightly less effective against bosses. Its high damage output does allow it to seriously wound a boss, but only at a dangerously close range. Its rate of fire can be increased by quickly pulling the trigger as opposed to holding the trigger down. It is generally a good idea to have at least one member of the team using a shotgun.

Tactics
When using the Auto shotgun, try to keep at least one shell loaded to prevent having to cock the gun after reloading.

Spamming a choke point at close range with the Auto shotgun is very effective against a Horde.