SKULL-4

The SKULL-4, a part of Skull series, may be of similar appearance to Skull-5 in Counter-Strike Online. It is  based on M14 EBR which Skull-5 also takes up its appearance from.

Overview
SKULL-4 are 2 dual-wielded anti-zombie rifle, each rifle loaded with 24 rounds of 5.56 anti-zombie cartridges finalizing an ammo of 48 developed by Rex Research Institute. Skull-4 is lightweight, low recoil with usable scope and deals critical damage to zombies.

Advantages

 * Very high damage to both human/zombies
 * High accuracy
 * Moderate recoil, even when moving
 * Moderate reload time
 * High reserve ammunition
 * Minimal speed reduction when zoomed
 * Penetrates up to 4 objects in a row
 * Lightweight for akimbo assault rifles
 * Usable scope
 * High damage for akimbo assault rifle

Disadvantages

 * Expensive in-game price and ammunition
 * Zooming decreases the rate of fire
 * Low rate of fire for akimbo assault rifle
 * Obtainable with cash points and during events only

South Korea
A coupon was released on April 4, 2013 at the price of 11800 Cash. It is bundled with permanent Skull-4 release pass, 14 days Strong Lifepower and 14 days Bomb Specialist.

This weapon was released on April 11, 2013.

Gallery
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Trivia

 * Skull-4 will be the first weapon in the Skull series to have an even number in its name. Thus, it is highly likely that its Balrog series counterpart might also have an even number in its name.
 * The estimated time period between the Skull-4 and the release of the last Skull series weapon, that is the Skull-11 on April 26 2012, will be about one year long.
 * This is the first dual-wielded assault rifle in Counter-Strike Online.
 * Skull-4's rate of fire is similar to Balrog-I.
 * Skull-4 is the first dual-wielded weapon that has usable scope.
 * The Skull is attached to the gun with ropes.
 * The tactical sight is tied, it's not well attached.
 * The reload animation is wrong, the user must pull the bolt after inserting new magazines.
 * Oddly, it's weight is lighter than dual wielding Skull-3's.