Vector

The Vector is a submachine gun featured in Call of Duty: Modern Warfare 2, and Call of Duty: Black Ops II. It was also seen in early trailers of Call of Duty: Modern Warfare 3. It also appears in the Behind The Scenes trailer of Call of Duty: Ghosts.

Campaign
In the campaign, the Vector is often found in use by enemies, most notably by the forces of the Ultranationalist Party, more specifically, the Spetsnaz, the Arctic Forces, and Shadow Company. However, a unique Vector with an ACOG Scope, Suppressor, and a black finish is used as a starting weapon in "Just Like Old Times", along with an Intervention with Suppressor.

Multiplayer
The Vector has the highest rate of fire and lowest recoil of any submachine gun in the game. The Vector deals the lowest damage per shot than any other weapon found in the game. The Vector is generally considered to be the one of the easiest submachine guns to use at long range given its low recoil. Despite its submachine gun status, it excels in more open maps, where medium to long range combat is required. The Vector combines the long range accuracy of an assault rifle with the high mobility, fire rate, and hip fire accuracy of a submachine gun, blurring the line between the two weapon types.

Despite these advantages, the Vector has some flaws. As the Vector burns through ammo due to its high rate of fire, Extended Magazines or the Scavenger Pro perk can be very helpful as this allows the player to continue achieving more kills in a life, or allows the player to kill more enemies before needing to reload. Bear in mind that the Extended Magazines will not increase the player's total ammo but only rounds per magazine. Sleight of Hand is also effective if Scavenger Pro or Extended Magazines are not available, although the reserved ammo will still be used quickly. The Silencer can also be effective since the player would not lose much power even if a silencer is used as it will almost always kill in five shots without Stopping Power, or four shots with it.

In Hardcore, the Vector's high rate of fire makes it a very deadly weapon, since it requires two shots to kill at any distance without Stopping Power, and one shot with Stopping Power at close range in normal circumstances.

Weapon Attachments

 * Rapid Fire
 * Akimbo
 * Red Dot Sight
 * Holographic Sight
 * Silencer
 * ACOG Scope
 * Thermal Scope
 * FMJ
 * Extended Mags

Call of Duty: Modern Warfare 3
The Vector was seen in some early trailers of Call of Duty: Modern Warfare 3. Also, the Vector's textures as well as menu icon can be found in the game files.

Call of Duty: Black Ops II
"Fully automatic submachine gun. Incorporates recoil mitigation technology."

- Description.

The Vector returns in Call of Duty: Black Ops II as the Vector K10. It is very similar to the Vector from Call of Duty: Modern Warfare 2 as it shares the same animations and uses a similar model, the only notable differences are the Vector K10 now holds 36 rounds rather than its original 30 and the foregrip is now missing without the specific attachment, whereas in Call of Duty: Modern Warfare 2, it was attached by default.

Multiplayer
The Vector K10 is unlocked at Level 16, making it the third submachine gun to be unlocked. The Vector K10 is a very balanced submachine gun, potent at close quarters combat but suffering outside of close quarters due to its poor range and damage. The damage is lower than the PDW-57 or the MSMC, so shot placement is key in order to compensate for its lower time to kill. It is tied with the Chicom CQB for the lowest recoil of any submachine gun with a rate of fire above 937 RPM by default, unless the Select Fire attachment is used. This raises the rate of fire to 1250, similar to the Skorpion EVO except with more range and less recoil. The recoil is relatively manageable and dependably controllable at close ranges. Despite this, the vertical recoil makes landing the required number of shots to kill at longer ranges more difficult, although the high center speed allows the Vector K10 to remain usable when burst fired. Since the Vector K10 has low damage, equipping a Suppressor has lesser effect on its time to kill than higher damage guns. It does possess the quickest reload-cancel time, although the difference is not significant when compared to others of its class. In conclusion, the Vector K10 has decent stats in almost all categories, but few that topple its peers. It is very comparable to the MP7, only with a lower recoil pattern, slightly less range, and different iron sights. As such, use of this weapon will likely come down to which recoil pattern or iron sights the user prefers.

Overall, the Vector K10 is a solid weapon and despite its average stats, it can be quite effective at close range and can compete with other weapons in its class.

Attachments

 * Reflex Sight (unlocked weapon level 2)
 * Laser Sight (unlocked weapon level 3)
 * Suppressor (unlocked weapon level 4)
 * Fast Mag (unlocked weapon level 5)
 * EOTech Sight (unlocked weapon level 6)
 * Foregrip (unlocked weapon level 7)
 * Quickdraw Handle (unlocked weapon level 8)
 * FMJ (unlocked weapon level 9)
 * Long Barrel (unlocked weapon level 10)
 * Target Finder (unlocked weapon level 11)
 * Adjustable Stock (unlocked weapon level 12)
 * Extended Clip (unlocked weapon level 13)
 * Select Fire (unlocked weapon level 14)
 * Rapid Fire (unlocked weapon level 15)
 * MMS (unlocked weapon level 16)

Call of Duty: Ghosts
It is shown in the Behind The Scenes trailer at 3:32, 3:36 and 3:45. Only its butt, grip and railing are seen in it.

Call of Duty: Modern Warfare 2

 * The words "Infinity Ward, Encino CA" are etched into the back of the weapon.
 * The orange color in fall camouflage for the Vector is slightly darker because the light grey in the texture files is slightly darker.
 * The player's hand model goes through the Vector's magazine housing. While this error can't be seen normally, it can clearly be seen while reloading and spinning to the left with a high sensitivity.
 * Strangely, the brass casings on the cartridges inside the Vector's magazine are black. These casings are also 2D.

Call of Duty: Black Ops II

 * The reload animation and the drawing animation for the Vector K10 is identical to the reload and drawing animation of its counterpart from Call of Duty: Modern Warfare 2.
 * On the side of the gun, it is possible to see ".45 ACP" written.
 * On the back side of the magazine, there is an engraving exactly the same as the back of the MPL; the two M's on two sides of a cube. Also, there is writing that says ".45" on the top of the magazine.
 * With the Select Fire Attachment, the Vector K10 fires two bullets in burst mode, instead of the usual three, similar to the AN-94.
 * In burst mode (with Select Fire equipped), clicking the 'fire' button rapidly can actually make the Vector K10 fire faster than its fully automatic's rate of fire.