Stopping Power

Stopping Power is a second tier perk in Call of Duty 4: Modern Warfare and is the most commonly used perk in the game. It increases the amount of damage done by its user's firearms by 40%, thus decreasing the time it must take to kill an enemy. It also cancels out Juggernaut (one of the reasons its popular), the second most used second tier perk in the game. Stopping power is in perk 2, which is said to be the best perk section in the game. Perk 2 also consists of UAV Jammer, Juggernaut, Overkill, Sleight of Hand, and many a few others. Stopping power is most often used on a M-16, and sniper rifles as it often allows a kill in one hit. However, it is not advisable for use with shotguns as they are very powerful without it. It also does not affect explosives—the perk Sonic Boom does.

Additional Multiplayer Tactics
This perk can be effective with multiple weapons. It can be added with high damage weapons making a player extremely dangerous. This perk with the ACOG equipped M16 is an effective substitute for those who like long range fights but are inexperienced with sniper rifles. With the AK-47 or M60, two rounds in the kill container can easily drop a medium ranged opponent. This perk can also compensate for lower powered weapons such as submachine guns. Players may use this with the MP5/P90 while retaining the weapons mobility and high ROF. Some ways you can beat this is to learn to aim a little higher. Headshots have the same effect as Stopping Power. When confronted up close learn to evade and fire in 3D. Try to land hits while on move if possible and force them to reload first. If it is a slow ROF weapon, a melee approach may be best.