Best gun on each class? - Battlefield 3

[Vodka.Please]

In your opinion what is the best gun on each of the classes - Assault, Engineer, Support and Recon.

Also what attachments you use

Somewhat new to this game but im enjoying it alot more then Mw3. Just need to know what guns to use and what not to use.

Cheers.

 

[Stinky Skunk]

I personally like the second sniper, IDK the name of it, havn't been on in a while, but its pretty good.