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. The second weapon does not accept Camo because weapons in the secondary slot cannot accept camos in general.

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

Call of Duty: Modern Warfare 3
Overkill allows players to carry two primary weapons, as in previous Call of Duty games, though the second weapon is incapable of accepting attachments. Overkill Pro allows the use of an attachment on the second primary. To unlock Overkill Pro, the player must earn 120 kills with their second primary weapon. This perk is featured in a default class giving the player a G36C and PP90M1. It is unlocked at level 47, the last of the Tier 2 perks.

Trivia

 * 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 an M1911 in World at War.
 * It is the only perk not compatible with the Specialist Strike Package.
 * It is considered fairly useless by many players, due to the fact that you can pick up another players weapon once killed.
 * A popular tactic is to use the Riot Shield with another primary weapon, making an effective combination.