What is your Favorite Gun and perks for Call of Duty Modern Warfare 2?

There are so many more challenges for the weapons I have only been playing a of the assault rifles. I have not even scratched the surface of the submachine guns or sniper rifles.

My favorite so far is the TAR 21 with heart beat sensor on Hardcore Headquarters Pro.

What is your favorite primary weapon in Modern Warfare 2?
What is your favorite secondary weapon?

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