The Weapon Specialist Upgrade is a bonus pickup featured in Call of Duty: Ghosts in Chaos Mode that is also purchasable from the Armory. Once picked-up and used, the player will have infinite ammo and will also have increased bullet damage.
The Weapon Specialist Upgrade is incredibly useful to activate when dealing with Barrier Hives, as it can allow users to lay a ton of damage into a hive without wasting ammo, speeding up the process of clearing the Barrier Hive.
When used, the Weapon Specialist Upgrade, when it expires, will leave a full magazine in whatever weapon the user is currently using when the Weapon Specialist Upgrade expires, regardless of how many bullets were in the weapon when the Weapon Specialist Upgrade was used. This can be manipulated to get free ammo and a free reload. This is especially useful for LMGs, which have lots of ammunition and terribly slow reloads. This can be best exploited by activating the Weapon Specialist Upgrade just as a weapon is on the verge of running out of ammo in a long magazine. The Weapon Specialist Upgrade can make the Weapon Specialist user less dependent on ammo drops from allies. The Weapon Specialist Upgrade is also devastating when used for a semi-automatic shotgun, allowing the user to lay down a tremendous amount of firepower without fear of the magazine running dry.
In addition to increasing bullet damage as well as giving a bottomless clip for a temporary period of time, the Weapon Specialist Upgrade will also temporarily highlight nearby Cryptids. This can be of severe benefit if the user has to find a Leper, as the Leper tends to hide.