SubZero tropics
it gives you more bullets
Gives extra swag points.
it gives you extra points and it makes the sound higher
it gives you quicker site aim.
It depends on your type of game style call of duty modern warfare 2 is fast any many people play it day and night and it has real guns,perks, customization for your guns,and a ranking system that gives you access to more guns so you decide.Did i mention the kill streak system that helps you gain more points.
it gives you the ac130 title and the gold cross emblem from mw1
It gives you Faster launcher lock-on + extra bullet damage vs. enemy air support. This makes Light Machine Guns extremely effective against enemy air support. It is really smart to use.
you can use a laser pointer in the special ops mission: Wardriving
It gives you the ability to shoot through thick walls or other objects and kill enemies.
You may need to update your xbox, it should come up right after it says that it cant read. that is what i had to do
It gives you the ability to aim down your weapon faster after running. Almost the same as sleight of hand pro.