Fast Mag

Fast Mag is an attachment and campaign perk featured in Call of Duty: Black Ops II.

Call of Duty: Black Ops II
It replaces the Sleight of Hand perk from previous Call of Duty games by decreasing the time it takes to reload the weapon. It acts in a similar manner to the Dual Mags attachment except that every reload is fast instead of every other reload and does not give extra reserve ammo.

For most weapons, it utilizes the same method as Dual Mags, taping two magazines together. However, the even reloads are also sped up. For weapons that don't have magazines that can be taped, the reload is simply faster. For pump-action shotguns, it reloads two shells at a time. For the Executioner, it reloads all five shells at the same time via a Speed Reloader.

Campaign
In Campaign the Fast Mag perk decreases the reload time for every weapon making it very useful with LMG's, Launchers and Special Weapons since they don't have the Fast Mag attachment available. It is unlocked by completing 2 challenges in "Judgement Day"