Overkill

"Carry two primary weapons, no pistol."

- Perk description

Overkill is a Tier 2 perk in Call of Duty 4: Modern Warfare, Call of Duty: World at War and Call of Duty: Modern Warfare 3 that allows the player to carry two primary weapons, instead of a primary weapon and sidearm (pistol). When using Overkill, the first primary weapon determines movement speed and character appearance, as it always does. The second weapon chosen when the perk is active cannot utilize any camouflage and has no effect on mobility or appearance, with the exception of the gun being visible on the player's back.

Call of Duty 4: Modern Warfare
Overkill is unlocked at level 38 in Call of Duty 4: Modern Warfare. Perks that affect weapons will affect both primary weapons a player carries, as all perks apply to the player and not their weapons. A player using Overkill will use an M9 during Last Stand in Call of Duty 4: Modern Warfare.

Call of Duty: World at War
It is unlocked at level 56 in Call of Duty: World at War. When in Last Stand a player will use a M1911 in Call of Duty: World at War if they have Overkill equipped.

Call of Duty: Modern Warfare 3
This is the final tier 2 perk unlocked. It allows players carry two primary weapons, as in previous Call of Duty games. The pro effect allows the secondary weapon to have two attacments. It is featured in a default class giving the player a G36C and PP90M1. It is unlocked at level 47.

Trivia

 * In Call of Duty 4, using Overkill with two LMGs and Bandolier will give the player a shared 700 ammo (100 mag, 600 spare).
 * If the player is in a private match and the rules are set to no perks, the player's secondary weapon is replaced by an M9 in Call of Duty 4, and M1911 in World at War.