Level 38, Lt. Colonel 1
Overkill allows the person to carry two main weapons, but no pistol.
In Call of Duty 4: Modern Warfare, the M14 rifle is unlocked at Level 46 in multiplayer.
15+ i think
level 4
Kill the boss in the last level.
depends if you are refering to live or what
You have to get to level 4.
When you reach level 38 you wil unlock the Overkill perk. You can use thi perk as your second perk and it allows you to use two primary weapons
There is none
by killing enemies, if your talking about online
get to level 55
play search and destroy