Call of Duty 4: Modern Warfare & Modern Warfare RemasteredEdit
Tier 2 Perk
Overkill is unlocked at level 38. It allows the player to carry a second primary weapon in place of their secondary. When using Overkill, the first primary weapon determines character appearance and movement speed. Perks that affect weapons affect both primary weapons the player carries, as all perks apply to the player and not their weapons. Players with Overkill use M9s during Last Stand, unless they picked up a handgun before being downed.
The same primary weapon cannot be chosen twice in a loadout.
Overkill allows players to carry two primary weapons, as in previous Call of Duty games, though the second primary weapon is incapable of accepting attachments or camouflages, but Proficiencies can still be applied. Overkill Pro allows the use of an attachment and application of camouflage on the second primary. To unlock Overkill Pro, the player must earn 120 kills with their second primary weapon. This perk is featured in the Grenadier default class giving the player a G36C and PP90M1. It is unlocked at level 47, making it the last of the Tier 2 perks unlocked.
This perk can be particularly useful for shotguns, as the secondary weapon can be used at long ranges where a shotgun would not excel due to its range limit. Likewise, a shotgun could be an ideal secondary weapon for another primary weapon (such as a sniper rifle) to be used at close quarter combat where shotguns excel over other weapon types.
The perk can also be seen as more ammunition, due to both weapons having the standard amount of ammo, or full with Scavenger. Scavenger Pro also makes both weapon's ammo count full at spawn. The player is unlikely to run out of both weapons' ammo even without Scavenger, so it is wiser to choose another Tier 1 perk, such as Sleight of Hand Pro to switch to the other weapon faster.
For most weapons, when first switching to the player's secondary weapon, the weapon's switch time is slower, as the first draw animation is the same as picking up the weapon off the ground. It is advisable to switch to the secondary weapon when spawning, and then switch back to the primary weapon, so the player will not have to do the longer switch animation during a firefight, which may cause the player to lose.
The second primary weapon may only be equipped with one attachment, unless Secondary Gunfighter is in use (which will give the player a maximum of two attachments for that weapon).
If the player intends to carry an Assault Shield as one of their primaries, its a good idea to make it their second primary. This will allow the player to equip two attachments on their other primary without spending a Wildcard (and gives the player the option to equip up to three).
Overkill returns in Call of Duty: Ghosts as an Elite perk. It allows players to carry two primary weapons. When this perk is equipped, the player may still select a secondary weapon, but a notification will appear, recommending them to take advantage of the perk by selecting a second primary weapon instead.
Overkill returns in Call of Duty: Black Ops III as a Wildcard. It is unchanged from previous installments, albeit unlocked at level 19, although since the second primary takes up the secondary slot, it can only have one attachment (or up to two with Secondary Gunfighter) and an optic, compared to the three attachments (or up to five attachments with Primary Gunfighter) with optic primaries can have in the primary slot.
Overkill returns in Call of Duty: Infinite Warfare as a Loadout Option. Unlike other Loadout Options, it must be selected separately from the second primary. Overkill costs only one Allocation Point (this does not include the cost of the weapon, optic, attachments or Secondary Expert). Because the second primary takes up the secondary slot, it can only have two attachments (or up to four attachments with Secondary Expert) and an optic, however the only downside to this is that Primary Expert allows one more attachment on a primary weapon in the primary slot.
In Call of Duty 4: Modern Warfare and Call of Duty: World at War, the perk's icon is that of dual pistols, despite allowing two primary weapons.
In Call of Duty: Modern Warfare 3, the default second primary weapon is an M4A1 unless said weapon was already chosen as the first primary, in which case, a MP5 will be displayed instead.
It is not compatible with the Specialist Strike Package, as being given it after spawning would defeat its purpose entirely. Despite this, there are sound files for the acquisition of Overkill when using the Specialist Strike Package, but they are never used.