OK, this is the first guide I've written , so I hope I get it right.  Anyway, like the title says, this is non-definitive, meaning people have different opinions on it, and my way isn't the only way.

First off: weapons.  To be successful in quickscoping, you're going to want to use the Intervention, as it is more accurate than the Barrett, and does more damage then the M21 or WA2000.  Also, I have found that a pistol is best for secondaries in quickscoping, for two reasons.

1) You whip it out really fast (that's what she said).

2) If you have a good trigger finger, you can dispatch enemies quite efficiently and quickly.

Now onto Perks.  Now, for Perk One you'll want