Shotguns
Shotguns are remarkably underpowered in Call of Duty 4, but what they lack in range they make up for in damage. If you know how to use it, the pump action shotgun can be very effective. A popular method can be used with the W1200, it is known as "Luring". Basically, you will jump out so a enemy a long distance away from you will see you. You then move away so they can no longer see you. You wait a short period of time, and then jump back again. You should find that your enemy has attempted to follow you. They will not have the time to stop. If you are using stopping power then you should have no problem dealing with them with one shot.