Infirmary

The Infirmary is a section of the camp in SAS: Zombie Assault 2, and can be reached via the Mess Hall. It costs $750 to unlock. The MG4 can be found and bought here. This area includes two Barricade sections.

Tips
Upon unlocking this room, a very large horde of Zombies (the weak, blue-shirt kind) will follow you out. Around five shots from the M870 (when the Zombies are corralled into a group) will do.