SKULL Series

Skull series weapons are mainly designed for anti-zombie purpose and developed by the Rex Research Institute.

Overview
The Skull series weapons usually made with special materials and mainly designed for anti-zombie purpose.The 5.56 AZ, .50 AZ cartridges and the blade of the Skull-9 are made with the new materials that secretly built by the government.These weapons usually does very high damage to zombies,it also effect for anti-personnel,although it's unsuitable.

Weapons
These weapons belong to the Skull series:
 * Skull-1: A break-frame double-action revolver based on the Russian made MP-412 REX revolver.It is chambered with .50 AZ rounds and fed with 7 rounds, first seen in the mission: Toxic city.The weapon is available to fire in two modes, "sharpshooting mode" and "rapid firing mode".It is the most suitable sidearm for use by anti-zombie operations.
 * Skull-5: A sharpshooting rifle based on the American made MK 14 EBR.It is chambered with 5.56 AZ rounds and fed with 24 rounds in a curved magazine.First seen in the mission, Deadend.It's suitable for snipers who are in the zombie battlefields.
 * Skull-7: A light machine gun based on the FN Minimi machine gun.It is chambered in 5.56 AZ rounds and fed with 120 rounds in a ammo box.It also comes with a scope and suitable to use for middle engagement.First seen in the mission, Chaos.It is suitable to use by machine gunner in zombie battlefields due to it has high suppression power.
 * Skull-9: A battleaxe bulit for anti-zombie purpose.It is very power in close range combat and suitable to use to kill zombies at close range or even use for destroy machines.It was released alongside with Metal Arena Mode.