It's pretty much where you zoom in on the person fast enough so you barely seem them, shoot, then zoom out, all in a quick motion.
There are two types of quickscoping - pop shot (you don't aim you just quickly zoom in until crosshairs vanish and shoot) and drag scope (while zooming in, move your aim to your enemy and then wait until crosshairs vanish and take the shot). go to YouTube and see some OpTic Nation's quickscoping gameplays and learn :)
You go to custom slot and pick your weapon and then for attachments you pick no attachments or something that doesn't come with a scope.
depending on the gun, there is different challenges for the gun, (10 headshots, etc.)
Quick scope
I myself am really good at no scoping on cod4 and i got good at it by simply practicing. Like the old fashion saying "practice makes perfect" is the thing to do in this case. The longer you play the more you'll get use to no scoping. There is no answer for "how to no scope" really. Everyone learns themselves.
yes
Practice.
By using seight of hand pro to scope faster.
yes
I play Modern Warfare on Xbox 360. I quick scope on sensitivity level 8. It may be different for you.
You can not quick scope in Black Ops as quick as you could in Modern Warfare 2, but it is still possible. Try no-scoping. In my opinion, it's more enjoyable.
yes! Its back just like it was in MW2.
Intervention.